KR100248107B1 - Low pitched sound transmission type speaker enclosure - Google Patents

Abstract

The present invention relates to a transmission type speaker enclosure that widens a low frequency response region of a driving speaker by forming a transmission pipe formed in a relatively small speaker space downwardly to the front side, and includes a front panel of the cabinets 200 and 300. Speakers 260 and 360 are installed in the 201 and 301, and there are a plurality of diaphragms 230, 240, 250, 330, 340 and 350 to the sound outlets 220 and 320. In a low-frequency transmission-type speaker enclosure comprising a plurality of transmission pipes 212, 214, 216, 218, 312, 314, 316, and 318, which are gradually narrowed, the inside of the cabinet 200. A plurality of diaphragms 230, 240 and 250 installed in the cabinet are installed to be inclined downward so as to be inclined downward to the front side of the cabinet 200 so that the transmission pipes 212, 214, 216 and 218 are inclined downward to the front side. It is a low-frequency transmission type speaker enclosure characterized in that it is formed in a manner.

Description

Bass Transmission Speaker Enclosure

1 to 4 is an exemplary view showing a conventional transmission speaker,

5 is a perspective view of a transmission type speaker enclosure according to a first embodiment of the present invention;

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

7 is a perspective view of a transmission speaker enclosure according to a second embodiment of the present invention;

8 is a cross-sectional view taken along line B-B of FIG.

9 is a cross-sectional view taken along line C-C,

10 is a sound pressure-frequency curve diagram of the sound measured at the speaker and the sound outlet of the first embodiment of the present invention,

11 is a sound pressure-frequency curve of sound representing the sum of the curves of FIG.

12 is a sound pressure-frequency curve of sound measured at the speaker and the sound outlet in the second embodiment of the present invention,

FIG. 13 is a sound pressure-frequency curve diagram of sound representing the sum of the curves of FIG.

<Explanation of symbols for main parts of drawing>

200: cabinet 201: front panel

202: rear panel 203, 204: side panel

205: top panel 206: bottom panel

210: transmission pipe 212: first transmission pipe

214: second transmission pipe 216: third transmission pipe

218: fourth transmission line 220: sound exit

222,223,224,225,226: Slope plate 230,240,250: Plate

260 speaker 270 attenuation material

300: cabinet 301: front panel

302: rear panel 303,304: side panel

305: transmission pipe 312: first transmission pipe

314: second transmission pipe 316: third transmission pipe

318: fourth transmission pipe 320: sound exit

322,323,324,325,326: Slope plate 330,340: Plate

350: middle plate 360: speaker

370: damping material

The present invention relates to a transmission type speaker enclosure that widens a low frequency response region of a driving speaker by forming a transmission tube formed in a relatively small speaker space inclined downward toward the front side.

A speaker is a device that converts an electrical signal into a voice signal (or sound wave), and is composed of a permanent magnet, a movable coil, a diaphragm, and a frame for fixing them.

When an electric signal corresponding to a negative voltage, that is, a current, flows in the movable coil, a force proportional to the current appears in the movable coil and the permanent magnet according to Fleming's law of loosening, which causes the movable coil to cause a piston movement. This piston movement causes the diaphragm to vibrate, so that the current, that is, a vibration proportional to the electrical signal, appears in the diaphragm, and as a result, almost equal vibration is generated in the air in the front and rear of the diaphragm to generate sound waves.

Sound may be defined as vibration generated in an object. Each time the object vibrates, the surrounding air is compressed and expanded, and the compression and expansion in the air continues.

Compression and expansion are called sound waves and their pitch is determined by the frequency of vibration and measured in hertz (Hz).

The intensity of sound is determined by the amplitude or distance the vibration object moves when the object vibrates and is measured in decibels (dB). Pitch is independent of loudness, where loudness is the superficial intensity of the senses received by the ear and intensity is the amount of energy in the sound waves.

Our ears are louder at a frequency of 100 Hz than at 50 Hz, and louder at a frequency of 1000 Hz than at 500 Hz, so our ears are louder to produce the same loudness as at higher frequencies at lower frequencies. Century energy is needed.

While the car is driving, the low noise of the tires and the engine noise reaching the road before entering the long tunnel is radiated by omnidirectional radial energy, but the noise and engine noise of the tire after entering the long tunnel is the When we encounter an obstacle, such as a wall that forms a reflecting surface, the sound waves will be reflected, spread back in a new direction depending on the direction of the reflecting surface, and will be heard at high intensity in our ears.

In the cabinet of the loudspeaker, the diaphragm's vibrating sound wave will be reflected by each wall it encounters, and the reflected wave will also encounter a wall that causes it to be reflected again, while a new wave will be generated by the vibration of the speaker diaphragm.

As a result, new vibrations exist, and this process is repeated until the various elements of the compound sound are effectively vortexed to establish standing waves and resonance effects as well as other phenomena that are very difficult to analyze and explain.

Therefore, although the overall effect can be measured, the reason for this is usually assumed, because it is difficult to examine the complexities of sound waves generated in the cabinet under the influence of the vibration diaphragm. Various formulas, concepts, and materials have been proposed to explain the performance of loudspeaker enclosures, but the final analysis found that the decisive factor for whether a particular loudspeaker enclosure produces sound at an appropriate intensity within the audible range is the human ear.

Rather than based on calculations that do not factor in the human response to the output, they are easily facilitated by the manufacturer, based on experimental determination of various enclosure, backloaded, and transmission-type parameters to obtain the required low frequency range of the sound. There is a need for an inexpensive, compact speaker enclosure that can be manufactured.

Accordingly, a speaker enclosure may be manufactured such that the sound generated from the rear surface of the speaker diaphragm is inverted through the sound path and the bass performance is improved by the rear radiated sound thereof. Patent Publication Nos. 3,944,757, 4,807,293, 3,523,589, and Korean Patent Application No. 92-5066.

3,944,757, the speaker has a diameter much smaller than the diaphragm 101 of the speaker as shown in FIG. 1, and passes through the waveguide 103 formed with a low pass filter to the low sound horn 102. It is a structure that amplifies bass by echoing.

However, the above patent can amplify the bass to some extent, but there is a problem that the bass is not amplified as much as desired, and has a disadvantage in that the manufacturing process has a complicated structure and the length of the waveguide is long.

The patent of the 4807293 uses a blocking plate 105 having a hole 106 below the middle of the rear portion of the diaphragm 111 of the speaker, as shown in FIG. A rear wall 108 is formed to form an enemy box and a space 109 is formed on the rear side of the sound collecting unit 107 and the horn 110 is attached to one side thereof so that the outlet of the horn 110 is connected to the front part of the speaker. It is formed to face.

Therefore, the patent connects a small volume box formed with the volume required for the minimum reproduction limit frequency of the driving speaker to the horn 110 so that sound generated from the rear of the speaker is radiated to the front of the speaker through the horn 110. (110) It is possible to improve the bass characteristics due to the load, but this patent has a structure in which the enclosure is forced to grow by the sound wave tube to the front by attaching a compartment so that the inside of the enclosure gradually increases in cross-sectional area, and the driving speaker is large. Because the sound pressure of the mid and high part of the front radiating sound is strong, the bass, which is the back radiating sound, is not properly displayed. Therefore, a large-caliber speaker, for example, an 8-inch or 12-inch speaker has to be applied. And vibrations are so large that the advantages are not achieved unless the room is relatively large. It took a lot of time.

In addition, since the bend plate 112 or the like must be bent functionally in an improved index, it is difficult to manufacture.

In addition, U.S. Patent No. 3,523,598 shows that the transmission path 115 is attached to the rear of the speaker to use the rear sound, as shown in FIG. Reflecting from the front wall 117 and the rear wall 116 and returning to the speaker 118, the offset of the air flow occurs and interferes with the vibration of the speaker 118 diaphragm, causing noise, and increasing the bass sound. Although there are many standing waves, it causes distortion of sound waves and the length of transmission tube is very long from 2.5m to 3m to obtain the bass effect, and the thickness of cabinet due to large and many standing waves is 18mm to 25mm The above results in an increase of raw materials and is expensive.

In addition, Korean Patent Application Publication No. 92-5066 discloses a waveguide for transmitting a sound wave collected by a sound collecting device 120 and a sound collecting device 120 at a predetermined distance, as shown in FIG. And a horn 122 that radiates and expands sound waves output from the waveguide 121, and the outlet portion of the waveguide 121 is enlarged to the horn 122, so that it becomes large and driven. The sound pressure difference of the sound that passes through the waveguide 121 is radiated to the front and back radiated from the front of the a) so that it is difficult to effectively secure the bass, the bass is effective in any part of the frequency band, and all the high, middle and low Amplification brings about phase interference, and the waveguide 121 has a cylindrical shape, so that there is a manufacturing problem and the value is very expensive.

Thus, a speaker for amplifying a low frequency sound of the related art is well known in the art, and a speaker unit is attached to a large cabinet, and the horn is gradually increased in cross section so that it is commonly called a backload type or transmission type speaker. In the structure of the speaker, there was a large end and a long sound wave tube.

Accordingly, an object of the present invention is to provide a relatively small transmission type speaker enclosure having a simple structure that forms a transmission tube by inclining a plurality of diaphragms downward to the front side and a structure that can sufficiently amplify existing insufficient bass even with low manufacturing cost. .

Another object of the present invention is to expand the low frequency range of the reproduced sound and increase the vibration intensity of the low frequency so that the small speaker, such as 4 inches or 5 inches, resembles the intensity of the bass generated by the bass speaker 10 inches or more. The overall goal is to provide an improved compact transmission speaker enclosure.

In order to achieve the above object, the present invention gradually reduces the cross-sectional area of the transmission tube from the sound collector to the acoustic outlet instead of shortening the overall length of the transmission tube through which sound waves generated from the diaphragm of the driving speaker installed in the cabinet are transmitted. By inclining downward toward the front side to generate air compression, it is possible to reproduce deep bass by amplifying and extending the existing low frequency intensity without installing a separate subwoofer or amplifier for low amplification. To the refraction of, the inclination plate is attached at a predetermined angle to change the direction of sound waves, that is, flow to the next transmission pipe and to minimize the standing wave and the negative diffraction phenomenon in the cabinet. It also serves to reinforce the plate strength between the transmission pipes. In this way, even if the thickness of the plate is thin, it is possible to prevent the occurrence of the phenomenon of bleeding.

Hereinafter, preferred embodiments of the present invention will be described in detail with the accompanying drawings.

5 is a perspective view showing an embodiment of the present invention, Figure 6 is a cross-sectional view taken along the line AA of Figure 5 showing the internal structure of this embodiment, the embodiment is high in height, thin in width and slightly deeper than the height It provides a small slim bass transmission enclosure.

In the first embodiment, the width X length X depth of the cabinet 200 is approximately 14 X 33 X 31 cm, and the total length of the transmission tube 210 formed in the cabinet 200 is about 120 to 130 cm, and the transmission tube 210 is The sound outlet 220 formed at the end and opened to the outside is an elliptical shape and the size of the horizontal X length is approximately 10 × 5 cm.

In addition, the diaphragm 230, 240, 250 constituting the transmission tube 210 has a thickness of 0.5 cm, and the speaker 260 has a diameter of 5,5 inches, that is, 13.3 cm.

In this embodiment, the speaker 260 is attached to the front panel 201 of the cabinet 200, the inside of the cabinet 200, the transmission pipe 210 from the rear of the speaker 260 to the lower portion of the cabinet 200 It is formed in a zigzag fashion.

The transmission pipe 210 is the first transmission pipe 212, the second transmission pipe 214, the third transmission pipe 216 by the diaphragm 230, 240, 250 attached to the front panel 201 and the rear panel 202, respectively. ) And a fourth transmission pipe 218.

The diaphragms 230, 240 and 250 are installed to be inclined downward at a predetermined angle to the front side of the cabinet 200, respectively, and the side portions of the diaphragms 230, 240 and 250 are attached to both side panels 203 and 204 in close contact.

The length of the diaphragm 230, 240, 250 is shorter than the length of the cabinet 200, preferably the length of the diaphragm 230, 240, 250 limits the rear height of each transmission pipe 212, 214, 216, 218 at the depth of the cabinet 200. It is formed to be so that the movement of sound waves is desired.

In other words, when each transmission pipe 212, 214, 216, 218 is deployed in a straight line, the overall taper from the first transmission pipe 212 to the fourth transmission pipe 218 is tapered such that the width of the upper and lower sides (ie, the cross-sectional area) becomes narrower toward the rear. It is intended to be in the sentence.

Incidentally, the inclined plates 222, 223, 224, 225, and 226 are attached to the diaphragm 230, 240, 250, the coupling portion of the front and rear panels 201 and 202, and the coupling portion between the upper and lower panels 205 and 206 at an angle of 30 to 45 degrees with respect to the vertical line.

The inclined plates 222, 223, 224, 225, and 226 are attached to the refractions of the transmission tubes 212, 214, 216, and 218, which means that the sound waves are diverted, that is, sound waves generated from the speaker 260 are transmitted from the first transmission tube 212 to the second transmission tube 214 and This is for the natural flow to the third transmission pipe 216 and the fourth transmission pipe 218.

In addition, the inclined plates (222, 223, 224, 225, 226) are attached at a predetermined angle to minimize the generation of standing waves in the cabinet 200 and the negative diffraction phenomenon, the inclined plates (222, 223, 224, 225, 226) in addition to the above-mentioned functions, each transmission tube (212, 214, 216, 218) By acting as a role of reinforcing the strength of the diaphragm (230, 240, 250) provided between, even if the thickness of the diaphragm (230, 240, 250) will be able to prevent the occurrence of the phenomenon.

In addition, the first and second transmission pipes 212 and 214 are filled with attenuation material 270 for preventing and blocking transmission of short and high frequency sound with short wavelengths. 216 and the fourth transmission pipe 218 to be discharged to the outside through the sound outlet 230.

7 is a perspective view showing a second embodiment of the present invention, Figure 8 is a cross-sectional view taken along the line BB of Figure 7 showing the internal structure of the present embodiment, Figure 9 is a cross-sectional view taken along line CC of Figure 7, this embodiment It is similar in height and width to provide a low-frequency transmission type speaker enclosure formed so as to have the same depth as in the first embodiment.

In the second embodiment, the width X length X depth of the cabinet 300 is 20 X 18 X 31 cm, the total length of the transmission pipe 310 formed in the cabinet 300 is within the range of 120 ~ 130 cm, the transmission pipe 310 The sound outlet 320 formed at the end and opened to the outside is elliptical in size and is 5X10cm in width X length.

In addition, the thickness of the diaphragm 330, 340 and the intermediate plate 350 constituting the transmission tube 310 is the same 0.5cm as in the first embodiment, the speaker 360 is 4.7 inches in diameter, that is 12cm Was used.

In the above embodiment, the speaker 360 is attached to an upper portion of the front panel 301 of the cabinet 300, and extends from the rear of the speaker 360 to the lower portion of the cabinet 300 inside the cabinet 300. It is formed in a zigzag manner of the transmission pipe 310 extending to the sound outlet 330 formed on the other side of the cabinet 300.

The transmission tube 310 is the first transmission tube (by the middle plate 350 installed vertically across the center of the cabinet 330 and 340 and the cabinet 300 attached to the left and right sides of the front panel 301, respectively) 312), the 2nd transmission pipe 314, the 3rd transmission pipe 316, and the 4th transmission pipe 318 are comprised.

The diaphragms 330 and 340 are installed to be inclined at an angle to the front side of the cabinet 300, and the side portions of the diaphragms 330 and 340 are attached to both side panels 303 and 304 and the intermediate plate 350 in close contact.

The length of the diaphragm 330, 340 is formed shorter than the length of the cabinet 300, preferably the length of the diaphragm 330, 340 is the rear end height of each transmission pipe (312, 314, 316, 318) in the depth of the cabinet 300 It is formed equal to the limit length so that the movement of sound waves is smooth.

In other words, when the transmission pipes 312,314, 316, and 318 are deployed in a straight line, the upper and lower widths (ie, cross-sectional areas) are narrow so that the overall shape from the first transmission pipe 312 to the fourth transmission pipe 318 may go backward. The paper is tapered.

On the other hand, the front side of the intermediate plate 350 forms a passage 315 for communicating the rear end of the second transmission pipe 314 and the front end of the third transmission pipe 316.

Inclined plates 322, 323, 324, 325 and 326 are attached to the bends of the transmission tubes 312, 314, 316 and 318 at an angle of about 30 to 45 degrees.

The inclined plates 322, 323, 324, 325, and 326 are attached to the refractions of the respective transmission tubes 312, 314, 316, and 318 so that sound waves generated from the speaker 360 are transferred from the first transmission tube 312 to the fourth transmission tube 318 as in the first embodiment. The air flows up to a natural level, minimizes the generation of standing waves in the cabinet 200 and the negative diffraction phenomenon, and also plays a role of reinforcing the strength of the cabinet 300.

In addition, as in the first embodiment, the first and second transmission pipes 312 and 314 are filled with the attenuation material 370, and only the long bass, which are wavelengths, are transmitted to the third and fourth transmission pipes 316 and 318 so that the sound outlet 320 is provided. It can be discharged to the outside through.

When the operation of the present invention configured as described above, that is, the flow of vibration in the transmission tube 210 is described with reference to the first embodiment, the vibration of the air generated from the rear side of the diaphragm during the operation of the speaker 260 is the first transmission tube ( 212) is formed to narrow the cross-sectional area toward the rear, so that the compressed 212 is moved toward the rear of the first transmission pipe (212).

The vibration of the air reached while being compressed at the rear of the first transmission pipe 212 is reflected by the inclined plate 221 attached between the upper panel 205 and the rear panel 202 to the second transmission pipe 214. The vibration of the reflected air is reflected downward by the inclined plate 222 attached between the diaphragm 230 and the rear panel 202 to be introduced into the second transmission pipe 214.

Since the second transmission pipe 214 is formed to have a smaller cross-sectional area toward the front, air is gradually compressed, and sound waves in the high and mid-range regions having short wavelengths during vibration of the air are attenuated by the attenuation material 270. The movement is blocked and only the vibration of the long bass region passes.

The vibration of the bass region passing through the second transmission pipe 214 is compressed in the same manner as the above while continuing to move downward to the third transmission pipe 216 and the fourth transmission pipe 218, and accordingly, Only the sound wave of the amplified is strongly discharged through the sound outlet 220 formed in the lower portion of the front panel 201.

In the fourth transmission pipe, the low frequency response region (60 Hz or less) is discharged more strongly.

On the other hand, in the second embodiment as well, vibration generated in the diaphragm rear surface of the speaker 360 is gradually compressed while passing through each of the transmission pipes 312, 314, 316, and 318, and low-tone sound having a strong intensity is emitted.

As described above, the present invention is to form a plurality of transmission tubes with a gradually reduced cross-sectional area in a zigzag manner to emit strong bass sounds by compressing the sound waves in the bass region.

10 and 12 show experimental results of the first and second embodiments of the present invention, respectively, which show the relationship between the sound pressure (sound volume) and the frequency of the sound measured in the low range. As a graph, according to the present invention, the sound pressure (shown in solid line) discharged through the transmission pipe to the sound outlet (shown in solid line) is greater than the sound pressure discharged through the speaker in the low range of reproduced sound (shown in tangential form). As a result, as shown in Figs. 11 and 13, the sound pressure that emits a strong sound pressure exerted by a speaker having a diameter of 10 inches or more even with a small-diameter speaker of about 5 inches as shown in Figs. It is represented by the frequency characteristic curve.

As described above, the present invention forms a plurality of transmission pipes gradually decreasing in cross section in a zigzag manner inclined downward toward the front side, so that high and medium sounds are blocked by attenuating material and pass only while compressing sound waves in the low range. According to the present invention, the transmission tube that gradually reduces the cross-sectional area of the air generated from the diaphragm is compressed without using a separate subwoofer or amplifier for low amplification. It is to increase the sound pressure of the bass region emitted by the, and its structure is also relatively simple to provide a low-frequency transmission type speaker enclosure at a low price.

In addition, the inclination plate is attached to the deflection portion of each transmission tube, so that the presence of the inclination plate improves the flow of sound waves and also serves as a reinforcement material. Not only is it effective, it can also be used as a low-enclosure for high performance in small size, and it can be used for television, automobile, and various small audio products because it can compensate for the disadvantage that the size of the conventional transmission tube has to be increased. Has an effect.

Claims (4)

Speakers 260 and 360 are installed on the front panels 201 and 301 of the cabinets 200 and 300, and a plurality of diaphragms 230, 240, 250, 330, 340 and 350 are provided therein. Low transmission type which is provided with a plurality of transmission pipes 212, 214, 216, 218, 312, 314, 316, 318 gradually narrowed toward the acoustic football 220, 320. In the speaker enclosure, the plurality of diaphragms 230, 240, 250 installed inside the cabinet 200 are installed to be inclined downward so as to be inclined downward toward the front side of the cabinet 200, thereby transmitting pipes 212, 214 ( 216) 218 is a low-frequency transmission-type speaker enclosure characterized in that the zigzag formed to be inclined downward toward the front side. The transmission pipes 312, 314 and 316 formed in the cabinet 300 to communicate with each other up, down, left and right by the diaphragm 330, 340 and the intermediate plate 350. 318, the transmission type speaker enclosure for low sound quality. The transmission pipes (212, 214, 216) of claim 1 or 2, formed by diaphragms (230), (240), (250), (330), (340), (350) in the cabinet (200). 218, 312, 314, 316, and 318 are inclined portions of the inclined plates 222, 223, 224, 225, 226, 321, 322, 324, 325 and 326, respectively. ), A low-transmission transmission-type speaker enclosure characterized in that it is installed to prevent the sound diffraction and standing wave generation. 5. The overall length of any one of claims 1, 3 and 4, wherein the total lengths of the transmission tubes 212, 214, 216, 218 and the transmission tubes 312, 314, 316, 318 are respectively. A transmission enclosure speaker for low sound quality, characterized in that it is within the range of 120 ~ 130cm.

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