JP2007184841A - Speaker cabinet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker cabinet optimal for a speaker device of a bass reflex system which has a wide reproduction frequency bandwidth in a low tone and can reproduce a natural sound in a range from a low audio band to a high audio band. <P>SOLUTION: A first resonator port 8 for widening the range in the low audio band of the sound reproduced by the speaker unit is formed on a baffle plate 1 to which a speaker unit of the speaker cabinet C is fixed. In addition to the first resonator port 8, second and third resonator ports 9 and 10, which are different from the first resonator port 8 in resonance frequency and different from each other, are formed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a speaker cabinet optimum for a bass-reflex speaker device.

  2. Description of the Related Art Conventionally, a book shelf type speaker device using a full range type speaker unit is known as a small speaker device installed in a narrow place such as a bookshelf.

  Since the entire speaker device is formed in a small size, not only the speaker cabinet but also a full range type speaker unit attached to the speaker cabinet is formed in a small size, and the diameter of the speaker cone of the speaker unit is small. Is also formed small. In general, such a small-diameter speaker cone is advantageous for reproduction of high sounds, but is not suitable for reproduction of low sounds.

Therefore, in the speaker device having the small speaker unit, the baffle plate to which the speaker unit is attached, the upper plate continuous to the upper end of the baffle plate, the lower plate continuous to the lower end of the baffle plate, and the baffle An opening is formed in a baffle plate of a speaker cabinet composed of a cabinet body composed of side plates continuous to the left and right ends of the plate, and a back plate that closes the back opening of the cabinet body, and the opening is formed inside the cabinet body. A duct extending to is attached to form one resonance port. Then, the sound radiated from the back surface of the speaker unit by the resonance port is resonated at a specific frequency, and the phase of the sound radiated through the resonance port through the cabinet body is reversed, from the front of the speaker unit. There has been proposed a bass reflex type speaker device that enhances the low frequency range in accordance with the phase of radiated sound. (For example, refer to Patent Document 1).
JP 2000-217178 A

  However, in the bass reflex type speaker device, the resonance frequency of the speaker device is single in order to use the resonance at one resonance port, and therefore, the resonance frequency with respect to a constant output of sound waves reproduced from the speaker unit. There has been a problem that it is difficult to obtain a speaker device having a wide reproduction frequency band in the low sound range because the sound pressure levels of the sound waves before and after the band are rapidly lowered.

  The present invention has an object to solve such a problem, and a speaker cabinet that is optimal for a bass-reflex type speaker device capable of reproducing a wide reproduction frequency band in a low frequency range and capable of reproducing a wide reproduction frequency from a low frequency range to a high frequency range. The purpose is to provide.

  In order to achieve the object, the invention according to claim 1 includes a baffle plate to which a speaker unit is attached, an upper plate continuous to the upper end of the baffle plate, a lower plate continuous to the lower end of the baffle plate, A cabinet body composed of side plates that are continuous to the left and right ends of the baffle plate, and a back plate that closes the rear opening of the cabinet body, wherein the baffle plate is a first for enhancing the low frequency range. A speaker cabinet having a resonance port, wherein the baffle plate includes second and third resonance ports having resonance frequencies different from those of the first resonance port and different from each other. is there.

  According to a second aspect of the present invention, in the first aspect of the present invention, the second and third resonance ports are respectively attached to the rectangular opening formed in the baffle plate and the opening. It is comprised from the duct extended inside a cabinet main body, A part of said duct is comprised by the wall surface of the said cabinet main body and a backplate, It is a speaker cabinet characterized by the above-mentioned.

  The invention according to claim 3 is the invention according to claim 2, wherein the openings of the second and third resonance ports are arranged side by side, and a partition plate is provided between the arranged openings, In the speaker cabinet, a part of the ducts of the second and third resonance ports is formed by a wall surface of the partition plate.

  According to the first aspect of the present invention, the baffle plate to which the speaker unit is attached, the upper plate continuous to the upper end of the baffle plate, the lower plate continuous to the lower end of the baffle plate, and the left and right sides of the baffle plate A cabinet main body composed of side plates continuous at the ends, and a back plate for closing the back opening of the cabinet main body, and the baffle plate has a first resonance port for enhancing a low frequency range. In the speaker cabinet, the baffle plate includes second and third resonance ports that have different resonance frequencies from the first resonance port and are different from each other. The sound radiated from the sound is resonated at a specific frequency, and the phase of the sound radiated through the first resonance port through the cabinet body is reversed. The desired low frequency range can be enhanced in accordance with the phase of the sound radiated from the front of the speaker unit, and the second and third resonances are different from each other in the resonance frequency and different from the first resonance port. By the port, also in the second and third resonance ports, the sound radiated from the back surface of the speaker unit is resonated at a specific frequency, and passes through the cabinet body and the second and third resonance ports. The phase of the radiated sound can be inverted to enhance the low frequency range in accordance with the phase of the sound radiated from the front of the speaker unit. For this reason, the low frequency range enhanced by the first resonance port and The bass range of different frequency bands can be enhanced. Then, the reproduced sound whose bass range is enhanced at the first resonance port is synthesized with the reproduced sound whose bass range different from the first resonance port is enhanced at the second and third resonance ports. The sound pressure levels of the sound waves before and after the low frequency range enhanced by the first resonance port can be controlled by the second and third resonance ports, and therefore the reproduction frequency band in the low frequency range is widened. Thus, a speaker device that can reproduce a wide reproduction sound from low to high can be obtained.

  In addition, the first, second and third resonance ports can enhance the reproduction sound of the low frequency range of the speaker device over a wide range, so that even a small speaker cabinet reproduces a rich bass sound similar to a large speaker device. In addition, it is possible to reproduce a rich bass sound similar to that of a large-sized machine with a smaller speaker cabinet as compared with a conventional bass reflex type speaker device. Therefore, the entire speaker cabinet is made smaller. be able to.

  According to the invention described in claim 2, the second and third resonance ports are respectively formed in a rectangular opening formed in the baffle plate and attached to the opening inside the cabinet body. And a part of the duct is constituted by the wall surface of the cabinet body and the back plate. Therefore, the second and third resonance ports are separated from the first resonance port inside the cabinet body. The interior of the cabinet body is divided into a plurality of compartments by configuring the ducts of the second and third resonance ports as ducts extending into the cabinet body using the wall surfaces of the cabinet body and the back plate. Ducts with sufficient length can be easily formed without complicated processing on the wall, preventing the processing cost from rising when forming the duct With wear, it can be a small speaker cabinet to form a duct having a sufficient effective length.

  According to the invention described in claim 3, the openings of the second and third resonance ports are arranged side by side, and a partition plate is provided between the arranged openings, and the second and second resonance ports are provided. Since a part of the duct of the resonance port 3 is constituted by the wall surface of the partition plate, a horizontal partition wall parallel to the lower plate of the cabinet body and a vertical partition wall parallel to the back plate are provided, and the cabinet As a duct using the wall surface of the partition plate by forming a L-shaped duct space extending from the baffle plate using the wall surface of the main body and the back plate to the inside of the cabinet body, and partitioning the duct space by the partition plate By configuring, a duct having a sufficient length can be formed more easily, and it is possible to further prevent an increase in processing cost when forming the duct, and even a small speaker cabinet It is possible to form a duct having a frequency effective length.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a speaker cabinet C according to an embodiment of the present invention, FIG. 2 is a rear view thereof, and FIGS. 3 and 4 are side sectional views of FIG.

  The speaker cabinet C includes a baffle plate to which a speaker unit (not shown) is attached, an upper plate 2 continuous to the upper end 1a of the baffle plate 1, a lower plate 3 continuous to the lower end 1b of the baffle plate 1, and the baffle plate. 1 is a vertically long rectangular parallelepiped box having a cabinet body 5 composed of side plates 4 and 4 that are continuous with left and right ends 1c and 1d, respectively, and a back plate 6 that closes a rear opening 5a of the cabinet body 5. It is configured as. As the material of the speaker cabinet C, wood such as coral, beech, and white birch, salvage material that has sunk on the sea floor, and the like are used. To form the speaker cabinet C, the upper plate 2, A cabinet body 5 is formed by fixing the lower plate 3 and the side plates 4 and 4 with fixing means such as an adhesive, and a back plate 6 is removably attached to the rear surface of the cabinet body 5 with fixing means such as screws and nails. However, the back plate 6 may be fixedly attached to the cabinet body 5 by an adhering means such as an adhesive.

  As shown in FIG. 1, a speaker mounting hole 7 to which a speaker unit (not shown) is attached is formed above the baffle plate 1, and for example, a full range type speaker unit is attached to the speaker mounting hole 7. It is supposed to be.

  Below the speaker mounting hole 7 of the baffle plate 1 is formed a first resonance port 8 for enhancing the low frequency range of the reproduced sound reproduced from the full range type speaker unit. As shown in FIGS. 1 and 3, the first resonance port 8 includes a circular opening 8 a formed in the baffle plate 1 and a circle attached to the opening 8 a and extending into the cabinet body 5. The duct 8b is formed by fixing a cylindrical tube such as a vinyl chloride tube to the back surface of the baffle plate 1 at the opening 8a portion by a fixing means such as an adhesive. The first resonance port 8 may be constituted by a rectangular opening and a prismatic duct attached to the opening, and two or more openings and the opening may be attached to the opening. You may make it comprise from two or more ducts.

  As shown in FIG. 1, second and third resonance ports 9 and 10 are formed below the baffle plate 1 in front view. The baffle plate 1 is formed with a horizontally long rectangular opening 11, and the left and right ends 11 a and 11 b of the opening 11 are respectively provided on the back surface of the baffle plate 1 as shown in FIG. A horizontal portion 12a which is perpendicular to the lower plate 3 and has a height h1 up to the upper end 11c of the opening 11 and extends from the back surface of the baffle plate 1 to the inside of the cabinet body 5, and an extended end portion of the horizontal portion 12a L-shaped support plates 12, 12 constituted by a vertical portion 12 b that rises upward are attached in close contact with the inner walls of the side plates 4, 4 of the cabinet body 5.

  Between the horizontal portions 12 a and 12 a of the support plates 12 and 12, a horizontal partition wall 13 extending from the back surface of the baffle plate 1 to the inside of the cabinet body 5 along the upper end 11 c of the opening 11 is parallel to the lower plate 3. It is attached to become. In addition, a vertical partition wall 14 that is spaced apart from the back plate 6 by a predetermined distance and parallel to the back plate 6 is erected at the extending end of the horizontal partition wall 13. Thereby, as shown in FIG. 3, a duct space 15 having an L shape in a side view is formed inside the cabinet body 5. The horizontal partition wall 13 may be directly attached between the side plates 4 and 4 of the cabinet body 5 without providing the support plates 12 and 12.

  As shown in FIGS. 2 and 3, a partition plate 16 having the same shape as that of the support plate 12 is provided between the support plates 12 and 12. That is, the partition plate 16 is perpendicular to the lower plate 3 of the cabinet body 5 and has a height h1 up to the upper end 11c of the opening 11 and extends horizontally from the back surface of the baffle plate 1 to the interior of the cabinet body 5. It is formed in an L shape composed of a portion 16a and a vertical portion 16b that rises upward at the extending end of the horizontal portion 16a. The partition plate 16 partitions the opening 11 into two openings 9a and 10a, and the duct space 15 is partitioned into two ducts 9b and 10b, so that the second and third resonance ports 9, 10 are formed, and prisms 9b and 10b that are attached to the openings 9a and 10a and extend into the cabinet body 5 and have an L-shape in side view are formed. .

  Accordingly, the ducts 9b and 10b are formed using the wall surfaces of the lower plate 3, the back plate 6, the support plate 12, the horizontal partition wall 13, the vertical partition wall 14, and the partition plate 16 of the cabinet body 5. It has become. The support plate 12, the horizontal partition wall 13, the vertical partition wall 14, and the partition plate 16 are attached to the cabinet body 5 by being fixed by a fixing means such as an adhesive.

  As will be described later, of the openings 9a, 10a of the second and third resonance ports 9, 10, the opening 9a of the second resonance port 9 is formed to have a slightly larger lateral width than the opening 10a of the third resonance port 10. The length of the duct 9b of the second resonance port 9 is longer than the length of the duct 10b of the third resonance port 10. Therefore, the length of the vertical partition wall 14 that forms the duct space 15 partitioned by the partition plate 16 is such that the wall portion 14 a corresponding to the duct 9 b of the second resonance port 9 has the length of the third resonance port 10. It is formed longer than the wall portion 14b corresponding to the duct 10b.

  Further, a tapered portion 16c is formed at a tip portion facing the opening 11 of the partition plate 16, a tapered portion 13a is also formed at an extending end portion of the horizontal partition wall 13 forming the duct space 15, Tapered portions 17a and 17b are also formed at corners of the lower plate 3 and the back plate 6 that form the ducts 9b and 10b.

  Next, the first resonance port 8 and the second and third resonance ports 9 and 10 will be described. In general, in a small speaker device using a full range type speaker unit, a resonance port is formed on the baffle plate of the cabinet body to which the speaker unit is attached in order to enhance the low frequency range of the reproduced sound, and the rear surface of the speaker unit. The sound radiated from the sound is resonated at a specific frequency, and the phase of the sound radiated through the resonance port through the cabinet body is reversed to match the phase of the sound radiated from the front of the speaker unit. A bass reflex type speaker device is employed.

The resonance port is composed of a duct connected to the opening and the opening formed in the baffle plate, the resonance frequency of the resonance port is desirable that tuned near the lowest resonance frequency f ₀ of the speaker unit It is believed that. The resonance frequency of the resonance port is determined by the internal volume of the speaker cabinet, the cross-sectional area of the duct constituting the resonance port, and the length of the duct. The larger the duct cross-sectional area, the higher the resonance frequency. It is known that the longer the duct length, the lower the resonance frequency. Further, the cross-sectional area of the duct is approximately ½ of the diaphragm area of the speaker unit.

Accordingly, the first resonance port 8 of the present invention is provided in order to enhance the low frequency range of the reproduced sound reproduced from a full range type speaker unit (not shown) attached to the baffle plate 1. Specifically, the internal volume of the cabinet body 5 is 90 l, the diameter of the circular opening 8a constituting the first resonance port 8 is 82 mm (8R in FIG. 1), and the duct 8b connected to the opening 8a. The length from the front of the baffle plate 1 is 93 mm (8 L in FIG. 3), and these numerical values are determined from the lowest resonance frequency f _{0 of the} speaker unit attached to the baffle plate 1.

  In the present invention, in addition to the first resonance port 8, the baffle plate 1 has second and third resonance ports 9 having a resonance frequency different from that of the first resonance port 8 and different from each other. 10 is formed. The present inventors enhance the low frequency range different from the first resonance port 8 in the second and third resonance ports 9 and 10 to the reproduced sound in which the low frequency range is enhanced in the first resonance port 8. By synthesizing the reproduced sound, the sound pressure levels of the sound waves before and after the low frequency range enhanced by the first resonance port 8 can be controlled by the second and third resonance ports 9 and 10. In addition, it is found that the reproduction frequency band in the low sound range of the speaker device can be widened, and the resonance frequency of the baffle plate 1 to which the speaker unit is attached is different from that of the first resonance port 8 and different from each other. The second and third resonance ports 9 and 10 are formed.

  The inventors multiply the cross-sectional area 8S of the duct of the first resonant port 8 by a predetermined constant (1 to 1.3) to obtain the cross-sectional area 9S of the duct of the second resonant port 9 and the above-mentioned The sum of the cross-sectional area 10S of the duct of the third resonance port 10 and the cross-sectional area 9S of the duct of the second resonance port 9 and the cross-sectional area 10S of the duct of the third resonance port 10 are constant. It is a ratio (6: 5), and it is desirable to multiply the cross-sectional areas 9S and 10S of the duct by predetermined constants (1.093 for the second resonance port 9 and 1.169 for the third resonance port 10), respectively. The second and third resonant ports 9, 10 were formed by finding that a length of 9L, 10L was obtained.

  Further, when forming the second and third resonance ports 9 and 10, the inventors set the second and third resonance ports 9 and 10 as shown in FIGS. 1 and 2. Each of the openings 9a and 10a has a rectangular shape formed in the baffle plate 1 and ducts 9b and 10b that are attached to the openings 9a and 10a and extend into the cabinet main body 5. Are formed side by side, and a partition plate 16 is provided between the side openings 9a, 10a, whereby a horizontal partition wall 13 parallel to the lower plate 3 of the cabinet body 5 is formed. And a vertical partition wall 14 parallel to the back plate 6 to form a duct space 15 having an L shape in side view extending inside the cabinet body 5 using the wall surfaces of the cabinet body 5 and the back plate 6; In front of the duct space 15 Partitioning with the partition plate 16 to form the prism body ducts 9b and 10b using the wall surfaces of the cabinet body 5, the back plate 6 and the partition plate 16, the interior of the cabinet body 5 is complicatedly processed with a plurality of partition walls. The second and third resonant ports 9 and 10 were formed by finding that a duct having a sufficient length can be easily formed without doing so.

Specifically, the width of the opening 9a of the second resonance port 9 is 86 mm (9w in FIG. 1), the width of the opening 10a of the third resonance port 10 is 71 mm (10w in FIG. 1), and the openings 9a and 10a. The height of both is formed to 43 mm (h1 in FIG. 1). As described above, the ducts 9b and 10b obtained by multiplying the cross-sectional areas 9S and 10S (see FIG. 2) of the ducts 9b and 10b of the second and third resonance ports 9 and 10 by a predetermined constant respectively. each length 9 L, 10L, the length of the duct 9b 9 L is 402Mm (those obtained by adding 9 L ₁ and 9 L ₂ in FIG. 3), 10L ₁ and 10L ₂ length 10L of the duct 10b is 359Mm (Figure 4 Is added).

  In the present invention, the baffle plate 1 to which the speaker unit is attached has a resonance frequency different from that of the first resonance port 8 and different from each other in addition to the first resonance port 8 for enhancing the low frequency range. Since the second and third resonance ports 9 and 10 are provided, the first resonance port 8 causes the sound radiated from the back surface of the speaker unit to resonate at a specific frequency, and passes through the cabinet body 5 to be the first resonance. In addition to reversing the phase of the sound radiated through the port 8 to match the phase of the sound radiated from the front of the speaker unit, the desired low frequency range can be enhanced, and the resonance frequency is The second and third resonance ports 9 and 10 which are different from the resonance port 8 and different from each other resonate sound radiated from the back surface of the speaker unit at a specific frequency. Then, the phase of the sound radiated through the cabinet body 5 and the second and third resonance ports 9 and 10 is inverted, and the low frequency range is adjusted in accordance with the phase of the sound radiated from the front of the speaker unit. Therefore, it is possible to enhance the low frequency range of the frequency band different from the low frequency range enhanced by the first resonance port 8. Then, the reproduced sound whose bass range is enhanced by the first resonance port 8 is reproduced by the second and third resonance ports 9 and 10 whose bass range different from the first resonance port 8 is enhanced. As a result of the synthesis, the sound pressure levels of the sound waves before and after the low frequency range enhanced by the first resonance port 8 can be controlled by the second and third resonance ports 9 and 10. Can be widened, and the speaker device can reproduce a wide reproduction sound from low to high.

  In addition, the first, second and third resonance ports 8, 9, and 10 can reinforce the low frequency reproduction sound of the speaker device over a wide range, so that even a small speaker cabinet can be as large as a large speaker device. A rich bass can be played, and even a bass speaker similar to a large machine can be played with a smaller speaker cabinet compared to a conventional bass reflex speaker device. It can be made smaller.

  In the present invention, the second and third resonance ports 9 and 10 are attached to the rectangular openings 9a and 10a formed in the baffle plate 1 and the openings 9a and 10a, respectively. Since the ducts 9b and 10b are partly formed by the wall surfaces of the cabinet body 5 and the back plate 6, the first resonance port is formed inside the cabinet body 5. When the second and third resonance ports 9 and 10 are formed separately from 8, the ducts 9b and 10b of the first and second resonance ports 9 and 10 are connected to the wall surfaces of the cabinet body 5 and the back plate 6. By constituting as a duct extending inside the used cabinet body 5, the cabinet body 5 has a sufficient length without being complicatedly processed by a plurality of partition walls. Transfected with can be easily formed, it is possible to prevent the rise in the processing cost for forming the duct, even in small speaker cabinets can form a duct having a sufficient effective length.

  In the present invention, the openings 9a and 10a of the second and third resonance ports 9 and 10 are arranged side by side, and a partition plate 16 is provided between the arranged openings 9a and 10a. Since part of the ducts 9b and 10b of the third resonance ports 9 and 10 are constituted by the wall surface of the partition plate 16, the horizontal partition wall 13 parallel to the lower plate 3 of the cabinet body 5 and the back plate 6 And a vertical partition wall 14 that is parallel to the bottom wall 14 to form an L-shaped duct space 15 extending from the baffle plate 1 using the wall surfaces of the cabinet body 5 and the back plate 6 toward the inside of the cabinet body 5. The duct space 15 is partitioned by the partition plate 16 and configured as the ducts 9b and 10b using the wall surfaces of the cabinet body 5, the back plate 6 and the partition plate 16, so that a duct having a sufficient length can be more easily obtained. Can be formed, it is possible to prevent more soaring processing cost for forming the duct, even in small speaker cabinets can form a duct having a sufficient effective length.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. That is, in the above-described embodiment, the second and third resonance ports 9 and 10 are connected to the rectangular openings 9a and 10a, and the ducts 9b and 10b that are attached to the openings 9a and 10a and extend into the cabinet body 5. However, the second and third resonance ports 9 and 10 may be composed of a circular opening and a duct attached to the opening. In short, if the ducts of the second and third resonance ports 9 and 10 are formed at a constant ratio and have a length obtained by multiplying the duct cross-sectional area by a predetermined constant, Its shape is not a problem.

  In the embodiment described above, the openings 9a and 10a of the second and third resonance ports 9 and 10 are formed side by side below the baffle plate 1 as viewed from the front. In order to obtain a feeling, the ducts 9b and 10b of the second and third resonance ports 9 and 10 are formed with less man-hours, and the openings 9a and 10a are formed above or on the side of the baffle plate 1. Alternatively, the openings 9a and 10a may be formed apart from each other.

It is a front view which shows the speaker cabinet of one Embodiment of this invention. It is a rear view of the speaker cabinet of FIG. It is the sectional view on the AA line side of the speaker cabinet of FIG. It is a BB line side sectional view of the speaker cabinet of FIG.

Explanation of symbols

C speaker cabinet 1 baffle plate 2 upper plate 3 lower plate 4 side plate 5 cabinet body 6 back plate 7 speaker mounting hole 8 first resonance port 8a opening 8b duct 9 second resonance port 9a opening 9b duct 10 third resonance port 10a opening 10b duct 11 opening 12 support plate 12a horizontal part 12b vertical part 13 horizontal partition wall 14 vertical partition wall 15 duct space 16 partition plate 16a horizontal part 16b vertical part

Claims (3)

A cabinet comprising a baffle plate to which a speaker unit is attached, an upper plate continuous to the upper end of the baffle plate, a lower plate continuous to the lower end of the baffle plate, and side plates continuous to the left and right ends of the baffle plate, respectively. A speaker cabinet including a main body and a back plate that closes a back opening of the cabinet main body, wherein the baffle plate includes a first resonance port for enhancing a low frequency range;
The speaker cabinet, wherein the baffle plate includes second and third resonance ports having a resonance frequency different from that of the first resonance port and different from each other.   Each of the second and third resonance ports includes a quadrangular opening formed in the baffle plate and a duct attached to the opening and extending into the cabinet body, and a part of the duct The speaker cabinet according to claim 1, wherein the speaker cabinet is constituted by a wall surface of the cabinet body and a back plate. The openings of the second and third resonance ports are configured side by side, and a partition plate is provided between the aligned openings, and part of the ducts of the second and third resonance ports are 3. The speaker cabinet according to claim 2, wherein the speaker cabinet is constituted by a wall surface of the partition plate.

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