JPH08140176A - Speaker - Google Patents

Abstract

PURPOSE: To improve tone quality and to relax restrictions on design. CONSTITUTION: When sounds from a speaker unit 30 attached to a baffle plate 14 in a cabinet 11 of a speaker 10 are guided by the sound path formed in the cabinet 11, they are emitted to the outside from plural slits 12 provided in the cabinet 11. Plural peaks due to resonance are generated in the acoustic pressure characteristics when dimensions of the sound path are made longer at the time of guiding the sounds from the speaker unit 30 by the sounds path, but bands of these peaks due to resonance can be changed by the length of the sound path. Further, bands of these peak frequencies tend to fall by slits 12 provided in the cabinet 11; and therefore, the frequency of sounds to be emphasized can be controlled in accordance with the length of the sound path and setting of slits 12. Since the design of the cabinet 11 can be realized only with slits 12, the tone quality is improved, and restrictions on design are relaxed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker which improves the sound quality when a small speaker unit is incorporated.

[0002]

2. Description of the Related Art Conventionally, a speaker used in a video game device, for example, tends to be a small speaker because of its installation space and cost. Therefore, a speaker unit housed inside a cabinet is inevitable. It is small in size.

FIG. 13 shows the basic structure of a speaker. A small speaker unit 3 is attached to a baffle plate 2 on the front surface of a cabinet 1 with its opening facing outward. Sound is emitted to the front side of the baffle plate 2.

[0004]

However, in the speaker used in the above-mentioned conventional video game apparatus or the like, the speaker unit 3 is small because of the above-mentioned reason, and its reproduction band is narrow on the high frequency side. Since it was limited to the part, it had a high pitched sound, and there was a problem that there was an offensive sensation. Further, since the speaker unit 3 is attached to the baffle plate 2 on the front surface of the cabinet 1, the speaker unit 3 has a high degree of exposure, which imposes restrictions on the design.

The present invention has been made in view of such circumstances, and an object thereof is to provide a speaker capable of improving sound quality and relaxing design restrictions.

[0006]

According to the first aspect of the present invention,
A baffle plate is installed inside the cabinet to form a sound path,
A speaker configured such that sound from a speaker unit attached to the baffle plate is guided by the sound path and then emitted to the outside from a plurality of slits provided in the cabinet.

The invention according to claim 2 is characterized in that the sound emission port of the speaker unit is arranged so as to be orthogonal to the sound path.

According to a third aspect of the present invention, the length dimension of the sound path is set such that the first and second peaks due to the resonance mode in the acoustic characteristics of the speaker unit alone occur. It is characterized in that the band of the first and second peaks can be changed by changing the length dimension or changing the setting of a plurality of slits provided in the cabinet.

[0009]

In the speaker of the present invention, the sound emission port of the speaker unit attached to the baffle plate inside the cabinet is arranged so as to be orthogonal to the sound path, and the sound from the speaker unit is formed inside the cabinet. When guided by the sound path, it is emitted to the outside from a plurality of slits provided in the cabinet.

When the sound from the speaker unit is guided by the sound path, as the dimension of the sound path is lengthened, a plurality of peaks due to resonance occur in the sound pressure characteristic.

Further, the band of the peaks due to these resonances can be changed by the length of the sound path, and the band of these peak frequencies tends to be lowered by the slits provided in the kibnet.

Therefore, the frequency of the sound to be emphasized can be adjusted according to the length of the sound path and the setting of the slit. In addition, the sound output port of the speaker unit is attached to the baffle plate provided inside the cabinet so that it is orthogonal to the sound path.
Since the sound from the speaker unit is emitted to the outside from the slit, the speaker unit can be covered by the cabinet, the flexibility of the mounting position of the speaker unit is increased, and the cabinet design is expressed only by the slit. Is possible.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the speaker of the present invention. As shown in the figure, the speaker 10 is attached to both sides of a cabinet 21 that houses the monitor 20.

2 to 4 show the details of the speaker 10, in which a plurality of horizontally long slits 12 are vertically formed at one corner of the cabinet 11 of the speaker 10. A baffle plate 14 is arranged on the opening 13 side of the cabinet 11. The baffle plate 14 is fixed to the cabinet 11 by fixing a flange 15 provided around the baffle plate 14 to the outer surface of the cabinet 11. A speaker unit 30 is attached in the middle of the baffle plate 14. The mounting state of the speaker unit 30 is such that the sound emission port of the speaker unit 30 is orthogonal to the sound path described later.

The opening 13 side of the cabinet 11 is closed by the baffle plate 14 so that the inside of the cabinet 11 is kept in a sealed state and a sound path of the sound emitted from the speaker unit 30 is formed. The sound guided by the road is emitted to the outside from each slit 12 of the cabinet 11.

Next, the sound field analysis based on the size of the sound path inside the cabinet 11 will be described. The conditions in the analysis described below assume that the diaphragm vibrates at a constant speed, and the analysis range is 100 Hz to 10 k.
HZ.

First, in FIG. 5, the dimension of the sound path is 33.7 ×.
3 mm and the size of the diaphragm of the speaker unit 30 is 2
The resonance wavelength at this time is λ / 4 = 33.7 × 10 ⁻³ λ = 0.135, and therefore f = v / f = 340 / 0.135 = 2518Hz, Theoretically, a peak will occur near 2.5 kHz.

FIG. 6 shows a simulation under such a condition, and a peak is observed around 2.3 kHz.

Next, FIG. 7 shows the dimensions of the sound path as 52 × 3.
mm and the size of the diaphragm of the speaker unit 30 is 2 mm.
This is a model when it is set to 2.7 mm, and the resonance wavelength in the case of n = 1 is λ / 4 = 52 × 10 ⁻³ λ = 0.21, and therefore f = v / f = 340 / 0.21 = 1619Hz Theoretically, a peak will occur around 1.6 kHz.

The resonance wavelength in the case of n = 2 is λ / 2 = 52 × 10 ^-3 λ = 0.104, and therefore f = v / f = 340 / 0.104 = 3269Hz, which is theoretically around 3kHz. A dip will occur.

Further, the resonance wavelength in the case of n = 3 is 3λ / 4 = 52 × 10 ^-3 λ = 0.069, and therefore f = v / f = 340 / 0.069 = 4927Hz, which is theoretically 4. A peak will occur near 5 kHz.

FIG. 8 shows the result of simulation under such a condition. The peaks are observed near 1.6 kHz and 4.5 kHz, and the dip is observed around 3 kHz.

FIG. 9 is a model for analyzing the influence of the slit 12 provided in the cabinet 11, and FIG. 10 shows the characteristics when the width Δd of the slit 12 is variously changed.

That is, the width Δd of the slit 12 is 1 m.
As can be seen from the characteristic diagram when m, 0.75 mm, and 0.5 mm, there is a tendency that the smaller the width Δd of the slit 12 is, the lower the peak frequency is. This is considered to be because the length of the sound path is slightly increased by adding the slit 12.

FIG. 11 shows acoustic characteristics measured with the horizontally long box 40 attached, assuming that the speaker 10 is actually used. As shown in FIG. 12, in the case of the speaker 10 alone. , Peaks are seen around 500Hz and 2kHz, but the system characteristics when the speaker 10 is attached to the box 40 are such that the peaks are slightly lower than around 500Hz and 2kHz, and the sound pressure level is also slightly lowered. I understand.

Therefore, by appropriately setting the size of the sound path inside the cabinet 11 and the width of the slit 12, the first and second peaks can be emphasized, and even in the small speaker unit 30, the mid-high range is achieved. The playback bandwidth at is widened.

As described above, in this embodiment, when the sound from the speaker unit 30 attached to the baffle plate 14 inside the cabinet 11 is guided by the sound path formed inside the cabinet 11, the cabinet 11
It is emitted to the outside from a plurality of slits 12 provided in the.

When the sound from the speaker unit 30 is guided by the sound path, if the size of the sound path is lengthened, a plurality of peaks due to resonance occur in the sound pressure characteristic.
The band of peaks due to these resonances can be changed depending on the length of the sound path, and the band of these peak frequencies tends to be lowered by the slits 12 provided in the kibinette 11.

Therefore, the frequency of the sound to be emphasized can be adjusted according to the length of the sound path and the setting of the slit 12, and the baffle plate 14 provided inside the cabinet 11 can be adjusted.
Since the sound emission port of the speaker unit 30 is attached so as to be orthogonal to the sound path and the sound from the speaker unit 30 is emitted to the outside from the slit 12, the speaker unit 30 can be covered with the cabinet 11. As the degree of freedom of the mounting position of the speaker unit 30 is increased and the design of the cabinet 11 can be expressed only by the slits 12, the sound quality can be improved and design restrictions can be relaxed.

[0030]

As described above, according to the speaker of the present invention, the sound emission port of the speaker unit attached to the baffle plate inside the cabinet is arranged so as to be orthogonal to the sound path. When the sound from the unit is guided by the sound path formed inside the cabinet, it is emitted to the outside through a plurality of slits provided in the cabinet.

When the sound from the speaker unit is guided by the sound path, if the dimension of the sound path is lengthened, a plurality of peaks due to resonance occur in the sound pressure characteristic. Also,
The band of peaks due to these resonances can be changed depending on the length of the sound path, and the band of these peak frequencies tends to be lowered by the slits provided in the kibnet.

Therefore, the frequency of the sound to be emphasized can be adjusted according to the length of the sound path and the setting of the slit. In addition, the sound output port of the speaker unit is attached to the baffle plate provided inside the cabinet so that it is orthogonal to the sound path.
Since the sound from the speaker unit is emitted to the outside from the slit, the speaker unit can be covered by the cabinet, the flexibility of the mounting position of the speaker unit is increased, and the cabinet design is expressed only by the slit. As a result, it is possible to improve the sound quality and relax design restrictions.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a speaker of the present invention.

FIG. 2 is a front view showing the speaker of FIG.

FIG. 3 is a left side view showing the speaker of FIG.

FIG. 4 is a cross-sectional view showing the speaker of FIG.

5 is a diagram for analyzing a sound field based on the dimensions of the sound path inside the cabinet of the speaker of FIG.

6 is a diagram showing acoustic characteristics based on the dimensions of the sound path inside the cabinet of FIG.

7 is a diagram for analyzing a sound field when the dimensions of the sound path inside the cabinet of FIG. 5 are changed.

8 is a diagram showing acoustic characteristics based on the dimensions of a sound path inside the cabinet of FIG.

9 is a diagram for analyzing a sound field when the cabinet of FIG. 5 is provided with slits.

10 is a diagram showing acoustic characteristics when various widths of the slits in FIG. 9 are changed.

FIG. 11 is a diagram for analyzing a sound field when the speaker of FIG. 1 is attached to a horizontally long box assuming an actual use state.

FIG. 12 is a diagram showing a comparison between the acoustic characteristics when the speaker of FIG. 11 is attached to a horizontally long box and the acoustic characteristics of the speaker alone.

FIG. 13 is a cross-sectional view showing a configuration example of a conventional speaker.

[Explanation of symbols]

 10 speaker 20 monitor 11 and 21 cabinet 12 slit 14 baffle plate 30 speaker unit

Claims (3)

[Claims] 1. A baffle plate is provided inside a cabinet to form a sound path, and after a sound from a speaker unit attached to the baffle plate is guided by the sound path, a plurality of slits provided in the cabinet are connected to the outside. A speaker characterized by being configured to emit. 2. The speaker according to claim 1, wherein a sound emission port of the speaker unit is arranged so as to be orthogonal to the sound path. 3. The length dimension of the sound path is set such that the first and second peaks due to the resonance mode in the acoustic characteristics of the speaker unit alone are generated, and the length dimension of the sound path is changed. The speaker according to claim 1, wherein the bands of the first and second peaks are changed by changing the settings of a plurality of slits provided in the cabinet.