JP2018196065A - Small speaker device - Google Patents

Abstract

To provide a small speaker device with an excellent reproduction function in a wide low tone-range.SOLUTION: A first horizontal partition plate 23 is provided in an enclosure 3 to partition a speaker chamber 25 thereabove and an adjustment chamber 27 therebelow. A first gap 29 is formed between the rear end portion of the first horizontal partition plate 23 and a sound absorption material 13 of a back plate 11. A second horizontal partition plate 33 is provided in the enclosure 3 to form a duct 35 below the adjustment chamber 27. A second gap 37 is formed between the rear end portion of the second horizontal partition plate 33 and the sound abortion material 13 of the back plate 11. Between the first horizontal partition plate 23 and the second horizontal partition plate 33, a vertical division plate 39 for dividing the adjustment chamber 27 into right and left is provided.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a small speaker device having an excellent reproduction function in a low sound range.

  Since sound waves from the back of the speaker are in opposite phase to sound waves from the front of the speaker, if the back sound waves wrap around the front side of the speaker, the sound waves cancel each other and the sound reproduction function is degraded. Therefore, a sealed speaker device is used that secures the sound reproduction function by attaching the speaker to the front baffle plate part of the enclosure, surrounding the rear side of the speaker with the enclosure, and enclosing sound waves from the back of the speaker in the enclosure. . However, the main purpose of this sealed speaker device is to prevent the sound wave from the front of the speaker from being canceled by the back sound wave, so it actively enhances the playback function of a specific sound range. However, for example, a small sealed speaker device cannot sufficiently reproduce the low frequency range, so it is not suitable for viewing classical music or jazz that emphasizes the low frequency range.

  Therefore, when focusing on the low frequency range with a small speaker device, the low frequency sound wave with the opposite phase from the back of the speaker is inverted in the enclosure, and this low frequency sound with the same phase as the sound wave from the front of the speaker is reproduced. A bass-reflex type speaker device that actively reinforces the reproduction function of the low frequency range by releasing is often used (see, for example, Patent Document 1).

Registered Utility Model No. 3154917

  In the bass reflex type speaker device described in Patent Document 1, the peripheral sound range of a low resonance frequency determined by the capacity of the air chamber and the length of the duct is inverted in the duct and output from the opening. The generated sound range has the same phase as the sound wave from the front of the speaker, and the inverted output sound range is reinforced and reproduced. However, since the bass reflex type speaker device has a single resonance frequency, the range of the low frequency range to be enhanced is narrow. Therefore, in order to secure the wide bass enhancement effect, for example, a double bass reflex type speaker device having two ducts as shown in FIG.

  In such a double bass reflex type speaker device, since it can have two resonance frequencies, it is possible to enhance in a wide bass range, but it is possible to secure an enhancement effect in a wider sound range, or here There is a case where it is desired to enhance a sound range different from the bass range that is enhanced by.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a small speaker device that can enhance a low sound range and can cope with such a problem.

  In order to achieve this object, a speaker device or a small speaker device according to the present invention is a speaker device or a small speaker device suitable for low-pitched sound reproduction, and an enclosure having an opening below a front baffle plate portion, A first horizontal partition plate portion provided on the upper side of the enclosure and dividing the inside of the enclosure into an upper first air chamber and a lower second air chamber; and the first air chamber. A speaker disposed on the front baffle plate (the front baffle plate), and a lower baffle plate provided on the lower side of the enclosure and forming a bottom of the second air chamber; A second horizontal partition plate portion that forms a duct connected to the opening between the first horizontal partition plate portion and the enclosure A first gap is formed between the rear baffle plate portion side of the first and a second gap is formed between the second horizontal partition plate portion and the rear baffle plate portion side of the enclosure. And it has further the division board part which divides | segments the said 2nd air chamber in the width direction.

  The speaker device or the small speaker device of the present invention has a double bass reflex structure having a first air chamber and a first gap, a second air chamber and a second gap, and a duct. Moreover, the second gap and the duct form, for example, an L-shaped long pipe. Therefore, since the first resonance tube is formed by the depth of the first air chamber, the first gap, the depth of the second air chamber, the second gap, and the duct, the length of the first resonance tube is long. It can be considered that the sound range of the frequency corresponding to is enhanced. Here, if a third gap is formed between the split plate portion and the rear baffle plate portion side of the enclosure, the depth of the first air chamber, the first gap, and the height of the split plate portion ( Since the second resonance tube is formed by the height of the rear end face of the dividing plate portion), the second gap, and the duct, it is possible to enhance the sound range of the frequency corresponding to the length of the second resonance tube. Can be considered.

  The second air chamber is divided in the width direction by the dividing plate portion. In the bass reflex structure including the second air chamber, the second gap, and the duct, the resonance frequency is lowered because the duct is long. If the resonance frequency here differs greatly from the resonance frequency of the bass reflex structure formed by the first air chamber and the first gap, a reproduced sound in which a dip occurs between the two resonance frequencies is formed. Therefore, the second air chamber is divided into two small-capacity air chambers so that the resonance frequency here does not become too low.

  If the dividing plate portion equally divides the second air chamber in the width direction, the resonance frequencies are equal on both sides of the second gap in the width direction. If the dividing plate section divides the second air chamber by different lengths in the width direction, the resonance frequency is different on both sides of the second gap in the width direction. Here, the speaker device of the present invention has a triple bass reflex type structure.

  If the first gap, the second gap, and the third gap have the same or substantially the same size, a smooth pipe line can be formed.

  In the small speaker device of the present invention, it is possible to enhance an abundant sound range while having a simple configuration.

1 is a perspective view of a small speaker device according to the present invention. It is a perspective view for showing the internal structure of a small speaker device. It is a longitudinal cross-sectional view of a small speaker apparatus. It is a cross-sectional view of a small speaker device. It is a perspective view which shows another division structure of a 2nd air chamber. It is a figure for demonstrating the function of a small speaker apparatus.

  First, the configuration of the small speaker device according to the present invention will be described with reference to FIGS.

  The small speaker device 1 includes a Lauan plywood enclosure 3 formed in a rectangular parallelepiped shape having a height of approximately 320 mm, a width of approximately 160 mm, and a depth of approximately 135 mm, and a speaker hole 7 provided in a front baffle plate portion 5 of the enclosure 3. A sound absorbing material 13 made of felt material and glass wool material is attached to the inner surface of the rear baffle plate portion 11 of the enclosure 3 and connected to an amplifier (not shown). A speaker terminal 15 is provided. Below the front baffle plate 5, the lower end of the front baffle plate 5, the upper surface of the bottom baffle plate 17 of the enclosure 3, and the inner surfaces of the left and right side baffle plates 19 of the enclosure 3 are approximately 12 mm high. An opening 21 is formed.

  In the enclosure 3, a first horizontal dividing plate 23 having a thickness of about 9 mm is provided at the lower end position of the speaker 9 or the speaker hole 7, and the inside of the enclosure 3 is located on the upper side by the first horizontal dividing plate 23. It is divided into a speaker chamber 25 (first air chamber) and a lower adjustment chamber 27 (second air chamber). The first horizontal partition plate 23 is connected to the inner surface of the front baffle plate portion 5 and the left and right side baffle plate portions 19 of the enclosure 3 at the front end portion and the left and right end portions, respectively. A first gap 29 of about 12 mm is formed between the portion 11 and the sound absorbing material 13. A glass wool 30 having a thickness of about 12 mm is provided on the inner surface of the front baffle plate portion 5 of the adjustment chamber 27.

  The enclosure 3 is also provided with a second horizontal partition plate 33 having a thickness of approximately 9 mm at the lower end position of the front baffle plate portion 5 or the upper position of the opening 21, and this second horizontal partition plate. 33, an opening having a height of approximately 12 mm is provided below the adjustment chamber 27 by the bottom surface of the second horizontal dividing plate 33, the upper surface of the bottom baffle plate portion 17, and the inner surfaces of the left and right side baffle plate portions 19 of the enclosure 3. A duct 35 opened at 21 is formed. The duct 35 has a length substantially equal to or close to the depth in the enclosure 3. The second horizontal sorting plate 33 has a front end portion and left and right end portions connected to the inner surface of the lower end portion of the front baffle plate portion 5 and the left and right side baffle plate portions 19 of the enclosure 3, respectively. And the rear baffle plate portion 11 or the sound absorbing material 13 so as to have a second gap 37 of about 12 mm. The second gap 37 is continuous with the duct 35. The first horizontal sorting board 23 and the second horizontal sorting board 33 are equal in size.

  Further, in the enclosure 3, a vertical dividing plate 39 that equally divides the adjustment chamber 27 left and right between the first horizontal dividing plate 23 and the second horizontal dividing plate 33 is perpendicular to the front baffle plate portion 5 or on the side surface. The first dividing chamber 41 is formed on one side of the vertical dividing plate 39, and the second dividing chamber 43 is formed on the other side of the vertical dividing plate 39. . The vertical dividing plate 39 is connected to the inner surface of the front baffle plate portion 5 of the enclosure 3, the lower surface of the first horizontal dividing plate 23, and the upper surface of the second horizontal dividing plate 33, respectively. A third gap 45 of about 12 mm is formed between the end portion (rear end surface) and the back baffle plate portion 11 or the sound absorbing material 13. The vertical dividing plate 39 is equal in length or depth to the first horizontal dividing plate 23 and the second horizontal dividing plate 33, and the first gap 29, the second gap 37, and the third gap 45 are approximately the same size. Are equal. The glass wool 30 is provided on both sides of the vertical dividing plate 39.

  In addition, as shown in FIG. 5, you may arrange | position the vertical division board 39 so that the adjustment chamber 27 may be divided | segmented unevenly right and left. Here, the first dividing chamber 41 on one side of the vertical dividing plate 39 has a large capacity, and the second dividing chamber 43 on the other side of the vertical dividing plate 39 has a small capacity.

  Next, the function of the small speaker device 1 will be described with reference to FIG.

  The speaker chamber 25 and the adjustment chamber 27 communicate with each other through a first gap 29, but the adjustment chamber 27 is divided into a first division chamber 41 and a second division chamber 43 by a vertical division plate 39. Therefore, the small speaker device 1 has the resonance frequency A in the speaker chamber 25 and the first gap 29. The adjustment chamber 27 and the outside communicate with each other through a second gap 37 and a duct 35. The adjustment chamber 27 is divided into a first division chamber 41 and a second division chamber 43 by a vertical division plate 39. Therefore, the small speaker device 1 has the resonance frequency B in the first division chamber 41 and the second gap 37 and the resonance frequency C in the second division chamber 43 and the second gap 37. A total of three resonance frequencies A, B and C. Here, since the first division chamber 41 and the second division chamber 43 are equally divided, the small speaker device 1 has two types of resonance frequencies A, B, and C. Therefore, it is possible to clearly emphasize the low frequency range around the resonance frequencies A and B or C. In addition, since the adjustment chamber 27 is divided into the first division chamber 41 and the second division chamber 43, the sound reverberation is suppressed, and the midrange is particularly clear. However, if the first division chamber 41 and the second division chamber 43 are formed in different sizes, the small speaker device 1 has three types of resonance frequencies A, B, and C. Therefore, the bass range that can be emphasized is expanded.

  Further, the small speaker device 1 has an overall length (the first gap 29 and the second gap, more precisely, the depth of the speaker chamber 25 is approximately 100 mm, the depth of the adjustment chamber 27 is approximately 100 mm × 2 and the length of the duct 35 is approximately 100 mm. A first resonance tube (including a height of 37) is formed (see arrow E), and a frequency range of 150 Hz to 180 Hz, for example, can be enhanced. In addition, the overall length of the speaker chamber 25 is approximately 100 mm in depth, the height of the rear end face of the vertical dividing plate 39 is approximately 150 mm, and the length of the duct 35 is approximately 100 mm (more precisely, the height of the first gap 29 and the second gap 37). Second resonance tube is formed (see arrow F), and the frequency range of 230 Hz to 260 Hz, for example, can be enhanced.

DESCRIPTION OF SYMBOLS 1 Small speaker apparatus 3 Enclosure 9 Speaker 23 1st horizontal dividing board 25 Speaker room (1st air chamber)
27 Adjustment chamber (second air chamber)
29 First gap 33 Second horizontal dividing plate 35 Duct 37 Second gap 39 Vertical dividing plate

Claims (5)

A small speaker device suitable for bass reproduction,
An enclosure having an opening on the lower side of the front baffle plate,
A first horizontal partition plate portion provided on an upper side in the enclosure, and dividing the enclosure into an upper first air chamber and a lower second air chamber;
A speaker disposed on the front baffle plate located in the first air chamber;
A second horizontal partition plate portion provided on a lower side in the enclosure, which forms a bottom portion of the second air chamber and forms a duct connected to the opening portion with a bottom baffle plate portion of the enclosure; With
A first gap is formed between the first horizontal partition plate portion and the rear baffle plate portion side of the enclosure,
A second gap is formed between the second horizontal partition plate portion and the back baffle plate portion side of the enclosure,
A small speaker device, further comprising a dividing plate portion that divides the second air chamber in a width direction.   The small speaker device according to claim 1, wherein a third gap is formed between the divided plate portion and the rear baffle plate portion side of the enclosure.   The small speaker device according to claim 2, wherein the first gap, the second gap, and the third gap are the same or substantially the same size.   4. The small speaker device according to claim 1, wherein the divided plate portion divides the second air chamber equally in a width direction.   4. The small speaker device according to claim 1, wherein the divided plate section divides the second air chamber into different lengths in the width direction. 5.

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