KR100868972B1 - Portable micro speaker test box - Google Patents

Abstract

A portable micro speaker test box reduces a test time by testing the micro speaker manufactured in a production line directly. A box body(200) has a hexahedron shape. A microphone is fixed and installed in the bottom center part of the box body. A hollow sound absorption tube is received inside the microphone. A speaker jig(500) is installed on an upper surface of the box body and the micro speaker is received in the speaker jig.

Description

Portable micro speaker test box {PORTABLE MICRO SPEAKER TEST BOX}

The present invention relates to a portable micro speaker test box, and more particularly, to a portable micro speaker test box that provides the same conditions as an unscented system.

In general, the principle of the micro speaker is that when the drum is beaten with a drumstick, the surface of the leather drum begins to vibrate. Due to this vibration, the air around the drum also begins to vibrate, and the vibration of the air propagates to the surroundings and can be heard through the human ear.

The medium for transmitting the vibration of the drum surface to the human ear is air, and the medium for transmitting sound can be transmitted not only through a gas such as air but also through a liquid such as water and a solid such as wood.

Eventually, we can say that the vibration of an object makes a sound. The sound of the object is shortened by tapping on the tree, but the sound continues for a long time by tapping on the drum.

In order to generate the sound, the material may be vibrated, but if it is slowly vibrated, low sound is generated. On the contrary, if it is vibrated quickly, high sound is generated. Even if the vibration frequency is increased, the loudness of the sound is also increased. Uses this principle to generate sound.

The general configuration of such a micro speaker is as follows.

The signal input to the micro speaker is an electric signal having sound information, and this electric signal contains all information related to the sound such as the loudness and the frequency, and is input to the electromagnet.

In this case, the direction of the N pole and S pole and the strength of the magnet are different according to this signal.At the rear of the electromagnet, a permanent magnet with a constant strength of the magnet is located. In addition to pushing and pulling, depending on the magnet strength of the electromagnet, the pushing and pulling force may increase or decrease.

One end of the electromagnet is attached to a round cone in the center of the micro speaker, and the cone moves together with the movement of the electromagnet, and eventually the solid attached to the cone moves.

Such a micro speaker is not only manufactured in accordance with its use but also differs in size and shape, and its characteristics are also different.

The characteristics of the micro speaker include a resonance frequency band, an impedance value, an output sound pressure level (SPL), a sound quality, etc., which is directly related to the quality of the micro speaker, and is also a measure of the quality of the micro speaker.

As a method of measuring the characteristics of such a micro speaker, a method of measuring the characteristic using an unscented system is used.

A general unscented system has a double wall structure as shown in FIG. 1, and has an outer wall 1 for sealing an inner space to block external noise and vibration, and a distance from the outer wall 1 to a predetermined distance inwardly. Discharge pipes having one end portion protruding through the inner wall 2 and the outer wall 1 and the inner wall 2, respectively, which are provided and form an anechoic chamber 6, which is a space enclosed therein. 5a and the suction pipe 5 and the other ends of the suction pipe 5 and the discharge pipe 5a to suck air into the suction pipe 5 and discharge the air into the anechoic chamber through the discharge pipe 5a. It consists of a temperature control device (4).

In addition, the inner surface of the inner wall (2) is provided with a sound absorbing member (3) consisting of a plurality of wedges (3a) having a triangular shape.

The operation of the unscented system having such a structure will be described as follows.

First, after arranging a product to measure the noise inside the anechoic chamber 6, the temperature control device 4 is operated to maintain the temperature in the anechoic chamber 6 to be suitable for the experiment.

At this time, the temperature control device 4 introduces air having a predetermined temperature into the anechoic chamber 6 through the discharge pipe 5a and at the same time sucks the air in the anechoic chamber 6 through the suction pipe.

When the temperature inside the anechoic chamber 6 is kept constant by the temperature adjusting device 4, the product placed in the anechoic chamber 6 is operated.

At this time, since the medium in which the noise frequency generated during operation of the product is propagated is air, the room temperature and humidity in the anechoic chamber are required to have certain conditions.

As the product installed in the anechoic chamber 6 is operated, noise is generated. At this time, the sound absorbing member 3 installed at the inner side of the anechoic chamber 6 absorbs the noise generated by the operation of the product to prevent the noise frequency from being reflected. do.

In order to prevent the noise frequency from being reflected in this manner, the sound absorption in the anechoic chamber 6 is preferably 100%, but generally the sound absorption member 3 having a sound absorption of 99% or more and a reflection rate of the noise frequency of 1% or less is used. .

The sound absorbing member 3 is composed of a plurality of wedges 3a, which have a triangular shape projecting inwardly of the anechoic chamber 6 so as to absorb the noise frequency generated by the product.

Accordingly, by operating the product in the anechoic chamber 6, it is possible to measure the inherent frequency generated in the product, so that the noise at the time of product operation can be accurately measured.

However, in the case of a micro speaker applied to a mobile communication terminal or a portable device, there is a method of moving a micro speaker manufactured after production in a production line to an unscented system and then measuring it. There is a problem.

In addition, in the case of a micro speaker applied to a mobile communication terminal or a portable device, the product is immediately tested after being manufactured in a production line to check whether it is a good product. Conventionally, in measuring sound quality, which is one of the characteristics of a micro speaker, a human hearing Only possible, because of this there is no objective standard of the micro-speaker caused a difficult problem in quality control.

The present invention is to solve the above problems, the portable micro-speaker to allow the objective quality control of the micro-speaker by performing the characteristics of the micro-speaker immediately in the production line in the same test box as the conditions of the anechoic system. The purpose is to provide a test box.

Features of the present invention for achieving the above object,

A box body formed in a hexahedron shape; A microphone fixedly installed at the center of the bottom surface of the box body; A hollow sound absorbing tube for accommodating the microphone therein; It is characterized in that the speaker jig is installed on the upper surface of the box main body is seated on the micro speaker.

Here, the portable micro speaker test box generates a test sound and transmits it to the micro speaker (MICRO SPEAKER), detects a test sound from the microphone to detect a frequency of a predetermined band, and the gain value of the frequency After the adjustment is further provided with a test equipment for detecting the defect.

Here, the constant band is 100 kHz to 10 kHz.

Here, the box body and the inner casing made of a wooden material of the rectangular parallelepiped shape; An outer casing made of metal formed on an outer side of the inner casing; It is made of a sound absorbing material attached to the inner surface and the inner bottom of the inner casing.

Here, the inner casing is formed in a square plate shape, the first fastening jaw is formed on the upper edge, and the upper plate is formed in the center of the coupling hole is coupled to the speaker jig; A plurality of side plates formed in a rectangular plate shape, having a second fastening jaw formed at one side of the edge, having equal intervals in the longitudinal direction, and having a first diffuse reflection groove formed thereon; It is formed in the shape of a square plate, a third fastening jaw is formed at the bottom of the rim, a second diffuse reflection groove is formed in a lattice form, a through hole through which the signal line of the microphone penetrates is formed in the center, and a pedestal is formed at the bottom edge portion. The installation consists of a fixed bottom plate.

Here, the top plate is further provided with an O-ring in the coupling hole for sealing with the speaker jig, the clamp is further provided on the side of the coupling hole to press-fix the speaker jig when the speaker jig is coupled.

Here, the side plate is projected by the first diffuse reflection groove of the first diffuse reflection projection of the hemispherical shape.

Here, the lower plate protrudes a second diffuse reflection protrusion having a trapezoidal shape by the second diffuse reflection groove.

Here, the sound absorbing material is a sponge material, irregularities are formed on one side.

Here, the inner casing is further attached to the cardboard between the side plate and the sound absorbing material.

Here, the corrugated cardboard is attached so that the bones therein intersect the first diffuse reflection groove of the side plate in a cross shape.

Here, the microphone is fixed by a hollow fixing tube in the box body to maintain a distance of 0.1 ~ 10 cm with the micro speaker seated on the speaker jig.

Here, the sound absorbing tube is formed of a sponge material and fixedly installed at the center of the bottom surface of the box body by a hollow support pipe.

According to the present invention portable micro speaker test box configured as described above, since the same condition as the unscented system is portable and portable, the micro speaker manufactured in the production line can be tested immediately after being installed in a plurality of production lines. This has the advantage of reducing test time.

In addition, since one operator can test the micro speaker using several test boxes, labor cost can be reduced, and thus, the unit cost can be relatively lowered.

Hereinafter, the configuration of a portable micro speaker test box according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the contents throughout the specification.

Figure 2 is a perspective view showing the configuration of a portable micro speaker test box according to the present invention, Figure 3 is an exploded perspective view showing the configuration of a portable micro speaker test box according to the present invention, Figure 4 is a cross-sectional view of FIG. 5 is a perspective view of the configuration of the top plate of the portable micro speaker test box according to the present invention, Figure 6 is an exploded perspective view of the configuration of the top plate of the portable micro speaker test box according to the present invention, Figure 7 is a portable micro speaker according to the present invention Figure 8 is a perspective view of the configuration of the side plate of the test box, Figure 8 is an exploded perspective view of the configuration of the side plate of the portable micro speaker test box according to the present invention, Figure 9 is a perspective view of the configuration of the lower plate of the portable micro speaker test box according to the present invention 10 is a configuration of the lower plate of the portable micro speaker test box according to the present invention To perspective.

2 to 10, the portable micro speaker test box 100 according to the present invention includes a box main body 200, a microphone 300, a sound absorbing pipe 400, a speaker jig 500, and a test. Equipment 600.

First, the box body 200 has an inner casing 210 made of an MDF material having a rectangular parallelepiped shape, an outer casing 220 made of aluminum formed outside the inner casing 210, and an inner surface of the inner casing 210. And a sound absorbing material 230 attached to the inner bottom.

The inner casing 210 absorbs and extinguishes low frequency frequencies, and the upper plate 211, the side plate 213, and the lower plate 215 can receive the original sound of the micro speaker 101 from the microphone 300 free from external noise. Is done.

The upper plate 211 is formed in a square plate shape as shown in Figure 5 and 6, the first fastening step (211-1) is formed on the top of the edge to enable the sealing with the side plate 213, the central portion A coupling hole 211-3 to which the speaker jig 500 to which the micro speaker 101 is seated is coupled is formed. Here, the O-ring (211-5) is formed in the coupling hole (211-3) for sealing with the speaker jig 500, the coupling hole to press-fix the speaker jig 500 when the speaker jig 500 is coupled The clamp 211-7 is further provided at the side surface of 211-3. Here, an additional jig for pressing the micro speaker 101 with the force of a spring may be further used at the upper end of the coupling hole 211-3.

As shown in FIGS. 7 and 8, four side plates 213 are formed in a pair, and are formed in a rectangular plate shape, and have a second fastening jaw to enable sealing with the upper plate 211 and the lower plate 215 on one side of the edge. 213-1 are formed, and the first diffuse reflection groove 213-3 is formed at equal intervals in the longitudinal direction. Here, the side plate 213 is a hemispherical first diffuse reflection projection by the first diffuse reflection groove (213-3) to diffuse the original sound radiated from the micro speaker 101 to block the input to the microphone 300 213-5) protrude.

9 and 10, the lower plate 215 is formed in a square plate shape corresponding to the upper plate 211, and a third fastening jaw 215-1 is formed at the lower edge of the edge, and the second plate in the form of a lattice. The diffuse reflection groove 215-3 is formed, and a through hole 215-5 through which the signal line 310 of the microphone 300 passes through is formed at the center thereof. Here, the lower plate 215 diffusely reflects the original sound emitted from the micro-speaker 101 to prevent the reflection sound from being input to the microphone 300, so that the second diffuse reflection of the trapezoidal shape by the second diffuse reflection groove 215-3 The protrusion 215-7 protrudes. Here, the lower plate 215 protrudes from the side surface of the through hole 215-5 with a mounting protrusion 215-9 on which the support pipe 410 to be described below is mounted.

The outer casing 220 blocks the high frequency frequencies present in and out of the inner casing 210 and seals the inner casing 210 by applying aluminum to the inner casing 210 to protect the inner casing 210. At this time, the base 221 is fixedly installed at the bottom edge of the outer casing 220.

Sound absorbing material 230 is a sponge material to absorb the original sound of the micro-speaker 101 to block the generation of the reflection sound, is formed in the uneven surface 231, that is, egg plate shape on one side, the side plate 213 of the inner casing 210 ) And the inner surface of the lower plate 215.

On the other hand, the cardboard 240 is further attached between the side plate 213 and the sound absorbing material 230 of the inner casing 210, the cardboard 240 is the first diffuse reflection groove (213-) of the bone inside the side plate 213. 3) and the cross (cross) is attached so as to cross reflect the original sound of the micro-speaker 101 to remove the reflection sound input to the microphone (300).

The microphone 300 is fixed by the hollow fixing tube 320 in the box body 200 to maintain a distance d1 between the micro speaker 101 mounted on the speaker jig 500 and a distance d1 of 0.1 to 10 cm. Here, the distance between the microphone 300 and the micro speaker 101 seated on the speaker jig 500 is preferably spaced at a distance of 1 cm, which can obtain the same conditions as the unscented system at a distance of 1 cm.

In addition, the sound absorbing pipe 400 is formed of a sponge material so that the traveling direction of the original sound transmitted from the micro speaker 101 is straight, and is fixed to the center of the bottom surface of the box body 200 by the hollow support pipe 410. Is installed. Here, the support pipe 410 is fixedly coupled to the mounting protrusion 215-9 of the lower plate 215.

In addition, the speaker jig 500 is a normal speaker jig for inspecting the micro speaker 101 and is installed on the upper surface of the box main body 200 so that the micro speaker 101 is seated.

On the other hand, the test equipment 600 generates a test sound and transmits it to the micro speaker (MICRO SPEAKER) 101, detects the test sound from the microphone 300 detects the frequency 100 kHz ~ 10 kHz, gain of the frequency After adjusting the (gain) value, detect whether it is defective.

Hereinafter, the operation of the portable micro speaker test box according to the present invention will be described in detail with reference to the accompanying drawings.

<< experimental example >>

First, to produce the inner casing 210, the top plate 211 is made of a square plate of 15 mm thick, 30 × 30 cm in height, width 7.5 mm, 1.5 cm in length on the upper edge of the first fastening jaw To form (211-1). At this time, the size of the coupling holes 211-3 of the upper plate 211 is formed to be 11 x 11 cm in width x length.

Then, two of the side plates 213 are made of a square plate having a thickness of 15 mm and a width of 18 x 30 cm, and a second fastening jaw 213-1 is formed with a thickness of 7.5 mm and a length of 1.5 cm.

In addition, two of the side plates 213 are made of a square plate having a thickness of 15 mm and a width of 18 x 28.5 cm, and a second fastening jaw 213-1 is formed with a thickness of 7.5 mm and a length of 1.5 cm. At this time, the radius of the first diffuse reflection protrusion 213-5 is formed to 5 mm, and the interval between the first diffuse reflection protrusion 213-5 and the first diffuse reflection protrusion 213-5 is formed to be 1.34 cm.

Further, the lower plate 215 is made of a square plate having a thickness of 15 mm and a width × length of 30 × 30 cm, and a third fastening jaw 215-1 is formed on the upper edge of the edge with a thickness of 7.5 mm and a length of 1.5 cm. At this time, the height of the second diffuse reflection projection 215-7 is formed to 5mm, the length of the bottom side is 0.5cm, the length of the upper side is 1cm, and the through hole 215-5 having a diameter of 1.8cm at the center To form.

On the other hand, the sound absorbing material 230 having an uneven structure having a thickness of 50 mm is attached to the upper plate 211, the side plate 213, and the lower plate 215 of the inner casing 210 with an adhesive. At this time, between the side plate 213 of the inner casing 210 and the sound absorbing material 230, a corrugated cardboard 240 having a thickness of 5 mm is attached by an adhesive.

The sound absorbing pipe 400 is formed to have an outer diameter of 9 cm, an inner diameter of 5 cm, and a height of 15 cm.

In addition, the microphone 300 is fixed to the upper surface of the fixing tube 320 of 1.8 cm in diameter and 16 cm in length, and the fixing tube 320 is inserted into and fixed to the through hole 215-5 of the lower plate 215. The height of 300 is kept 15 cm from the upper surface of the lower plate so that the distance from the micro speaker 101 is 1 cm. At this time, the signal line 310 of the microphone 300 is discharged to the outside through the fixing tube 320.

In this state, the first to third fastening jaws 211-1, 213-1, and 215-1 to the inner casing 210 are formed on the upper plate 211, the side plate 213, and the lower plate 215, respectively. After assembling each other using a piece or bolt, the outer casing 220 having a thickness of 1 mm is attached to the outer surface of the inner casing 210 to seal the inner casing 210. At this time, the outer casing 220 seals the remaining portion of the inner casing 210 except for the through hole 215-5 of the lower plate 215 and the coupling hole 211-3 of the upper plate 211. Then, the pedestal 221 is fixed to the bottom of the outer casing 220.

After the assembly is completed as described above, the speaker jig 500 is seated in the coupling hole 211-3 of the upper plate 211 of the inner casing 210, and then the clamp 211-7 is fastened. At this time, the top plate 211 and the speaker jig 500 is sealed between them by the pressing force of the clamp 211-7 and the O-ring 211-5.

Then, when the micro speaker 101 is seated on the speaker jig 500, the length of the micro speaker 101 and the microphone 300 is maintained at 1 cm.

`` Comparative Example 1 ''

As a result of experimenting with a micro speaker (model name SM1500B02B) manufactured by Light Source Tech Co., Ltd. in a portable micro speaker test box 100 and an unscented system according to the present invention, the results as shown in Tables 1 to 3 were derived. . At this time, the portable micro speaker test box 100 according to the present invention was compared with the output frequency as it is, without connecting the test equipment 600.

Table 1-Frequency Response Comparison

[Table 2] -THD (Total Harmonic Distortion) Comparison

Table 3-Impedance Comparison

Here, the blue line is the measurement result in the anechoic system, and the red line is the measurement result in the portable micro speaker test box 100 according to the present invention.

As can be seen through this, the THD and impedance can be confirmed to have almost the same measurement results, and since only the frequency gains are different in the frequency response, the waveforms are the same. Therefore, only the gain value of the frequency can be adjusted to confirm that the results match. .

`` Comparative Example 2 ''

As a result of experimenting with a micro speaker (model name: 15-8T-15W) manufactured by Kirin Telecom Co., Ltd. in a portable micro speaker test box 100 and an unscented system according to the present invention manufactured as described above with Tables 4 to 6 The same result was obtained. At this time, the portable micro speaker test box 100 according to the present invention was compared with the output frequency as it is, without connecting the test equipment 600.

Table 4-Frequency Response Comparison

[Table 5] -THD (Total Harmonic Distortion) Comparison

Table 6-Impedance Comparison

Here, the blue line is the measurement result in the anechoic system, and the red line is the measurement result in the portable micro speaker test box 100 according to the present invention.

As can be seen through this, the THD and impedance can be confirmed to have almost the same measurement results, and since only the frequency gains are different in the frequency response, the waveforms are the same. Therefore, only the gain value of the frequency can be adjusted to confirm that the results match. .

`` Comparative Example 3 ''

The results of the experiment of the micro speaker (Model: BRS-1728SL08) manufactured by Bujeon Electronics Co., Ltd. in the portable micro speaker test box 100 and the unscented system according to the present invention manufactured as described above are shown in Tables 7 to 9 below. Was derived. At this time, the portable micro speaker test box 100 according to the present invention was compared with the output frequency as it is, without connecting the test equipment 600.

Table 7-Frequency Response Comparison

[Table 8] -THD (Total Harmonic Distortion) Comparison

Table 9-Impedance Comparison

Here, the blue line is the measurement result in the anechoic system, and the red line is the measurement result in the portable micro speaker test box 100 according to the present invention.

As can be seen through this, the THD and impedance can be confirmed to have almost the same measurement results, and since only the frequency gains are different in the frequency response, the waveforms are the same. Therefore, only the gain value of the frequency can be adjusted to confirm that the results match. .

As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

The portable micro speaker test box according to the present invention can be applied not only to the field of micro speaker test in the field of micro speaker manufacturing, but also to the test in the field of manufacturing all acoustic devices.

1 is a cross-sectional view showing a general unscented system,

2 is a perspective view showing the configuration of a portable micro speaker test box according to the present invention;

3 is an exploded perspective view showing the configuration of a portable micro speaker test box according to the present invention;

4 is a cross-sectional view taken along line A-A of FIG.

5 is a perspective view of the configuration of a top plate of the portable micro speaker test box according to the present invention;

6 is an exploded perspective view of a configuration of a top plate of a portable micro speaker test box according to the present invention;

Figure 7 is a perspective view of the configuration of the side plate of the portable micro speaker test box according to the present invention,

8 is an exploded perspective view of a configuration of a side plate of a portable micro speaker test box according to the present invention;

Figure 9 is a perspective view of the configuration of the lower plate of the portable micro speaker test box according to the present invention,

Figure 10 is a perspective view of the configuration of the lower plate of the portable micro speaker test box according to the present invention.

<Explanation of symbols on main parts of the drawings>

101: micro speaker 200: the body of the box

210: inner casing 220: outer casing

230: sound absorbing material 300: microphone

400: sound absorption tube 500: speaker jig

600: Test Equipment

Claims (13)

A box body formed in a hexahedron shape; A microphone fixedly installed at the center of the bottom surface of the box body; A hollow sound absorbing tube for accommodating the microphone therein; A portable micro speaker test box formed on an upper surface of the box body and including a speaker jig in which micro speakers are seated; The box body, It is formed in a square plate shape, the first fastening jaw is formed at the upper edge of the edge, the upper plate is formed in the center plate and the coupling hole to which the speaker jig is coupled, and formed in a rectangular plate shape, the second fastening jaw is formed at one side of the edge A plurality of side plates having equal intervals in the longitudinal direction and having a first diffuse reflection groove formed in a square plate shape, a third fastening jaw formed at a lower edge of the edge, and a second diffuse reflection groove formed in a lattice shape; An inner casing formed of a lower plate having a through hole through which a signal line of the microphone penetrates in a central portion thereof, and a pedestal being fixed to a bottom edge portion; An outer casing made of metal formed on an outer side of the inner casing; And Portable micro speaker test box, characterized in that made of a sound absorbing material attached to the inner surface and the inner bottom of the inner casing. The method of claim 1, The portable micro speaker test box, Test equipment that generates a test sound and transmits it to the MICRO SPEAKER, detects a test sound from the microphone, detects a frequency of a predetermined band, and adjusts a gain value of the frequency and detects a defect. Portable micro speaker test box, characterized in that is further provided. The method of claim 2, The predetermined band, A portable micro speaker test box, characterized in that it is 100 Hz to 10 Hz. delete delete The method of claim 1, The top plate, O-ring is further formed in the coupling hole for sealing with the speaker jig, The portable micro speaker test box, characterized in that the clamp is further provided on the side of the coupling hole for pressing and fixing the speaker jig when the speaker jig is coupled. The method of claim 1, The side plate, A portable micro speaker test box, characterized in that the first diffuse reflection protrusion of the hemispherical shape is projected by the first diffuse reflection groove. The method of claim 1, The lower plate, The portable micro speaker test box, characterized in that the second diffuse reflection projection of the trapezoidal shape by the second diffuse reflection groove. The method of claim 1, The sound absorbing material, Portable micro speaker test box, characterized in that the sponge is formed, irregularities on one side. The method of claim 1, The inner casing, Portable micro speaker test box, characterized in that the cardboard further attached between the side plate and the sound absorbing material. The method of claim 10, The corrugated cardboard, Portable micro-speaker test box, characterized in that the inner bone is attached so as to cross the first diffuse reflection groove of the side plate in the form of a cross. The method of claim 1, The microphone, Portable micro-speaker test box, characterized in that fixed by a hollow fixing tube in the box body to maintain a distance of 0.1 ~ 10cm with the micro speaker seated on the speaker jig. The method of claim 1, The sound absorbing tube, A portable micro speaker test box formed of a sponge material and fixedly installed at a central portion of a bottom surface of the box body by a hollow support pipe.

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