JPH07107585A - Speaker system - Google Patents

Abstract

PURPOSE:To reduce the buffle effect and to improve the sound quality by making the 2nd buffle for the middle range or/and the high range speaker smaller than the 1st buffle for the low range speaker. CONSTITUTION:The high range and/or the middle range speaker are located with the prescribed distance from the 1st buffle 2 for the low range speaker. The 2nd buffles 27L and 27R which are made smaller than the 1st buffle are arranged. Thus, the buffle effect is reduced and the direct sound directly emitted from the speaker is increased compared with the intermediate sound to be emitted from the buffle board to the backside and the frequency characteristic in the middle area is improved, resulting in improving the good sound image location. The 1st buffle 2 and the 2nd buffle 27L and 27R are separated through pipes 26L and 26R and integrated so that the installation area can be reduced. Further, the 2nd buffles 27L and 26R are constructed to rotate freely in the horizontal direction and are made detachable from the 1st buffle 2 so that the large sound can be listened with the small sound volume.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system designed to reduce the baffle effect of a speaker.

[0002]

2. Description of the Related Art Generally, a front plate of a cabinet is a baffle plate. Therefore, when a diaphragm of a speaker vibrates, a direct sound emitted from the front face of the speaker is emitted behind the baffle plate. The baffle effect is generated by the sound waves.

Such a baffle effect will be described with reference to FIG. 9 which is a conventional speaker system. In FIG. 9, reference numeral 51 denotes a cabinet that constitutes a speaker system, and a baffle plate 52 that constitutes a front plate of the cabinet is a square with one side being Lm. A speaker unit 53 for bass and a speaker unit 54 for middle and high pitches are attached to the baffle plate 52.

The length L of one side of the baffle plate 52 as described above
The value of depends on the frequency, and reflects high frequencies in a predetermined frequency by the baffle effect. That is, λ (wavelength) is given by λ = 2L.

One side of the baffle plate 2 is L = 0.34 m.
Then, since the velocity v of the sound wave is 340 m, for example, λ
= 2 × 0.34 = 0.68 m, the frequency f is f = v /
λ = 340 / 0.68 = 500 (Hz).

That is, in the baffle plate 52 having one side L = 0.34 of the baffle plate, the indirect sound reflected on the back surface of the baffle plate 52 is reflected for 500 Hz or more as shown by the sound pressure-frequency characteristic curve 55 in FIG. Waves will be added.

[0007]

In FIG. 10, the vertical axis represents sound pressure (dB) and the horizontal axis represents frequency (Hz), and the frequency characteristic curve 55 shown by the solid line is the reflection from the baffle plate 52. , A case where peaks and valleys of about 6 dB occur in the frequency characteristic curve 5 in the range of 500 Hz to 10 kHz.
That is, the shaded area obtained by subtracting the solid line portion from the portion having no reflection at all is the portion that causes the sound quality deterioration due to the baffle effect. In addition, since the baffle effect disappears in the high range (10 k or more), the frequency characteristic curve 5
5 is flat.

The present invention reduces the baffle effect that occurs in the baffle plate of the conventional speaker system, increases the ratio of direct sound to indirect sound, improves the frequency characteristics in the middle range, and improves the sound quality. It is also an object to obtain a speaker system.

[0009]

As shown in FIG. 1, a speaker system of the present invention includes a first baffle 2 having a bass speaker and a second baffle 2 having a middle or / and treble speaker. Baffles 27L and 27R of the second baffle 27L and 27R, and the second baffles 27L and 27R are made smaller than the first baffle 2, and the first and second baffles 2 are provided at positions separated by a predetermined distance.
27L and 27R are arranged in parallel.

[0010]

According to the speaker system of the present invention, the second baffles 27L and 27R having high-tone or / and medium-tone speakers are arranged at a predetermined position from the first baffle 2 having a bass speaker. As a result, the direct sound emitted from the direct speaker is increased compared to the indirect sound emitted from the baffle plate to the back due to the reduced baffle effect, the frequency characteristics in the mid range are improved, and the sound image localization is improved. The excellent thing of is obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the speaker system of the present invention will be described below in detail with reference to the drawings. 1 to 6 show a speaker system of this example, FIG. 1 is a front view, FIG. 2 is a side view, third is a rear view, fourth is a perspective view, and FIG. 5 is an internal configuration diagram of a baffle. 6 is a plan view of the insertion portion of the second baffle holding portion.

1 to 6 show the speaker system of this embodiment as a whole. Cabinet to be a casing 2
Is a synthetic resin, and as shown in FIGS. 2 and 4, a front half 2A and a rear half 2B, which are formed in a front and rear semi-cylindrical shape, are combined,
As shown in FIG. 4, it has a tubular shape having an elliptical flat surface.

The lower part 3 of the cabinet 2 is formed integrally with the bottom plate and has an elliptic cylindrical shape smaller than the upper surface. A rectangular port 4 is formed in front of the front half 2A of the lower part 3 of the cabinet 2 in FIG. 4, and is formed as shown in FIG.

First, the front half 2A constituting the cabinet 2 will be described with reference to FIGS. 1 and 2 and FIG. 4, and a level adjusting knob 5 for a bass woofer built in the cabinet 2 above the port 4 and a master volume. A switch 7 for turning the power on and off is arranged in the same manner as the adjusting knob 6.

A rear projection 8 for mounting an input / output terminal is integrally formed on the rear surface of the rear half 2B constituting the semi-cylindrical portion, as shown in FIGS.

As shown in FIG. 3, the rear surface protruding portion 8 has a substantially rectangular shape when viewed from the rear surface, and corner portions 9L and 9R are formed on the left and right of the upper end of the rectangular portion 8A. The corner portions 9L and 9R are provided with through holes 10L and 10R as shown in FIGS.

On the rectangular portion 8A of the rear protruding portion 8, an amplifier for one channel of a bass speaker (woofer) for reproducing 50 to 200 Hz which constitutes the first baffle or a second baffle which will be described later is constituted. Power supply connection part 11 for driving an amplifier for two channels of a speaker for high and middle frequencies of 200 Hz to 20 kHz (squawker and / or tweeter) and output terminals (DIN terminals) 12L and 12R of an amplifier for driving the squawker and / or tweeter. Is provided.

Further, as will be described later, a screw stop portion 14L for rotatably holding the connection base portions 13L and 13R to the squawker and / or the tweeter constituting the second baffle.
And 14R.

Further, a portable magnetic recording / reproducing apparatus is provided in a substantially square recess 15 formed between both corners 9L and 9R.
A connection terminal (RCA type pin connector) for connecting the output of the portable electronic device 30 such as a CD reproducing device or a recording / reproducing device for a recordable / reproducible disc to an amplifier in the cabinet 2.
The DC power supply terminal 18 for the portable device 30 is attached to the portable device 30 as in 17L and 17R.

Further, as shown in FIG. 3, legs 18L and 18R having substantially the same height as that of the lower step portion 3 are integrally formed on the bottom surface of the rear surface protruding portion 8.

As shown in FIG. 4, an elliptical disk 19 made of aluminum or the like is placed on the upper surface of the cabinet 2 in which the front half 2A and the rear half 2B are integrated. Through holes 20a, 20b, 20c. A buffer board 21a, 21b, 2 made of rubber or the like, which is made of 20d and is pivotally attached to these through holes 20a, 20b, 20c, 20d in a removable manner.
It has 1c and 21d.

As shown in FIG. 5, the cabinet 2 in which the front and rear halves 2A and 2B are combined has a substantially linear internal structure in which a port 4 is formed at the lower end of the cabinet 2 to form a bass reflex cabinet (Bass-Reflex cabinet). -Cabinet: Abbreviated as Baffle: Baffe in this example).

In FIG. 5, 23 is a baffle plate, and this baffle plate 2
A woofer 22 is attached to 3. Although not shown, a two-channel amplifier for driving a squawker and the like as well as the above-mentioned one-channel amplifier for the woofer 22 are also incorporated in the casing constituting the cabinet 2.

Further, as shown in FIG. 1, FIG. 2, FIG. 4 and FIG. 5, a portable electronic device 3 driven by a primary or secondary battery.
The first baffle when 0 is placed on cabinet 2,
That is, buffer boards 21a to 21d are provided to block vibration of the woofer 22 from the cabinet 2.

Next, the structure of the connecting boards 13L and 13R will be described. The connection bases 13L and 13R are made of synthetic resin and are formed into a columnar shape with a rounded head. Through the through holes 25L and 25R inclined from one side of the columnar head to the other side below, the columnar head is formed. Arms, that is, the pipes 26L and 26R are inserted and fixed to one side end. Leads 12 led out from the amplifier output terminals 12L and 12R are inserted into the other through holes 25L 'and 25R' penetrating below the through holes 25L and 25R.
L'and 12R 'are inserted and pipes 26L and 26R
Through the inside, the second baffle 27 shown in FIGS.
It is connected to L and 27R squawkers and / or tweeters.

Further, the columnar lower stages of the connecting bases 13L and 13R are stepped portions 28L and 28R as shown in FIG.
And the through holes 10L of the corner portions 9L and 9R shown in FIG. 6 are formed.
And 10R so as to be rotatable. Stoppers 29L and 29R made of Ω-shaped metal or the like are attached to the lower ends of the stepped portions 28L and 28R.

A semicircular shaft insertion hole is formed upward on the bottom surface of the stepped portions 28L and 28R, and a shaft having a semicircular cross section is inserted into the shaft insertion hole. It is fixed to the connecting base. The tip of the shaft has couplings 32L and 32R.
It is configured to be rotatable with respect to. Fixed to the lower ends of the couplings 32L and 32R are fixed shafts 33L and 33R, which have both sides of the shaft removed in the longitudinal direction, and which have through holes formed in the fixed shafts 33L and 33R.
And 34R are made.

The connecting base portions 13L and 13 having the above-mentioned structure
According to R, if the fixed shafts 33L and 33R are fixed, the shaft including the connecting bases 13L and 13R is coupled to the coupling 32.
The upper side from L and 32R freely rotates clockwise or counterclockwise.

Therefore, the fixed shafts 33L and 33R of the connecting bases 13L and 13R are inserted into the rectangular fixing holes 35 formed in the through holes 10L and 10R of the corners 9L and 9R shown in FIG. 6, and the rear half (see FIG. 3). ) Screws are inserted from the screw stoppers 14L and 14R formed on the back surface of 2B, and the fixed shaft 33L
And by screwing with taps 34L and 34R of 33R,
Second baffles 27L and 27R and pipes 26L and 2
The coupling bases 13L and 13R including 6R are configured to be rotatable with respect to the cabinet 2, that is, the first baffle,
By removing the screws of the screw stoppers 14L and 14R, the first
The baffle and the second baffle can be made removable. In particular, it can be downsized if it is packed in a detached state during transportation or the like.

The through holes 10L and 1 of the corners 9L and 9R are also provided.
As shown in FIG. 6, the locking portion 36 is formed in the 0R, and both ends of the stoppers 29L and 29R abut on the locking ends 37 and 38 of the locking portion 36 so that the connecting bases 13L and 13R rotate in the horizontal direction. The angle is regulated so that it falls within a predetermined angle range.

That is, the clock C of the connecting bases 13L and 13R
Rotation of W or counterclockwise CCW causes the second baffle 27
L and 27R can be moved over a predetermined range in the horizontal direction of AA 'as shown in FIG.

Next, the second baffles 27L and 27R attached to the tips of the pipes 26L and 26R will be described. The second baffles 27L and 27R are those in which high-midrange speakers are built into casings 40L and 40R that are cabinets having a spherical ellipse and a spherical cabinet with a major axis diameter φ of about 100 mm, and the tips of the pipes 26L and 26R. In FIG. 2, the casings 40L and 40R have shafts 41L and 4 in the direction from the back side to the front side or from the front side to the back side in FIG.
It is configured to be rotatable around 1R. Therefore, in FIG. 1, the second baffles 27L and 27R are the pipes 26L and 26R.
It becomes possible to perform a swinging motion in the horizontal direction around R.

According to the above-configured speaker system of the present invention, the casing 4 containing the speaker for middle and high frequencies is built in.
0L and 40R have a major axis diameter φ of about 100 mm, so L = 0.1 m, and in the case of this example, the wavelength λ is λ = 2L = 2 × 0.1 = 0. 2m, so the frequency f is v / λ = 340 / 0.2 = 17
It becomes 00 (Hz).

Therefore, the first and second baffles are separated in this way, and the first baffle 2 has L = 0.3 as in the conventional case.
If the length is 4 m, then the second baffles 27L and 27R can be made smaller as L = 0.1 m as compared with the first baffle 2, and the same as in FIG. 10 in which direct sound and indirect sound (reflected wave) are added. The frequency characteristic curve is as shown in FIG. 7, and the area of the shaded portion of the difference between the direct sound and the indirect sound can be half or less compared with FIG. That is, the reflected wave of the indirect sound, which is the cause of the sound quality deterioration, is reduced, the baffle effect can be reduced, and the faithful sound quality can be reproduced. In the above-mentioned case, L of the first baffle 2 was set to 0.34, but it was confirmed that a sufficient effect can be obtained even if L = 0.2 m, which is about twice as large as that of the second baffles 27L and 27R.

Further, the first and second baffles 2 and 27
Since L and 27R are integrated via a pipe, it is possible to reduce the installation area by about 1/4 as compared with a small component component.

Further, FIG. 8 shows a plan view of the speaker system of this example. As shown in this plan view, the speaker system 1
The listener 50 located in front of the second baffle 27L counterclockwise CCWs the second baffle 27L with respect to the connecting base 13L and the pipe 26L.
And rotate the second baffle 27R to the connecting base 13R.
Also, it is assumed that the pipe 26R is rotated in the clockwise direction CW and brought to a position close to the listener's 50 ear. For example, the distance from the ears between both second baffles 27L and 27R is 2
Assuming a distance of 5 cm, the distance to the normal mid-high range speaker is at least 1 m from the listener 50. In this example, 20 log
It becomes 100/25 = 12 dB, and if the volume from the speaker is considered to be the same, a loud sound of 12 dB can be heard. On the contrary, if the volume is the same, the volume can be reduced by 12 dB in this example, so that the volume of sound leakage (noise) to the outside can be reduced.

[0037]

According to the speaker system of the present invention,
Since the second baffle is smaller than the first baffle and is arranged at a position apart from the first baffle, the baffle effect can be reduced and a speaker system with improved sound quality can be obtained.

Further, since the first baffle and the second baffle are separated and integrated via a pipe, it is possible to obtain the one in which the installation area can be made extremely smaller than that of a small component component.

Furthermore, since the second baffle is horizontally rotatable with respect to the first baffle, and the second baffle can be easily attached to and detached from the first baffle, it is close to the listener's ear. With, you can use the headphones and speakers in the middle, and you can listen to loud sounds at a low volume.
In addition, it has an effect that it can be miniaturized at the time of carrying or packing and a convenient product can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a speaker system of the present invention.

FIG. 2 is a side view of the speaker system of the present invention.

FIG. 3 is a rear view of the speaker system of the present invention.

FIG. 4 is a perspective view of the speaker system of the present invention.

FIG. 5 is an internal structural diagram of the speaker system of the present invention.

FIG. 6 is a plan view of the insertion portion of the second baffle holding portion of the present invention.

FIG. 7 is a frequency characteristic diagram of the baffle of the present invention.

FIG. 8 is an operation explanatory diagram of the speaker system of the present invention.

FIG. 9 is a perspective view of a conventional speaker system.

FIG. 10 is a frequency characteristic diagram of a conventional baffle.

[Explanation of symbols]

 1 Speaker system 2 Cabinet (1st baffle) 4 ports 26L, 26R Pipe 27L, 27R 2nd baffle

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Ichikawa 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (3)

[Claims] 1. A first baffle having a bass speaker and a second baffle having a mid-range and / or treble speaker, wherein the second baffle is provided in comparison with the first baffle. Make it smaller,
A speaker system in which the first and second baffles are arranged at positions separated by a predetermined distance. 2. The first baffle and the second baffle are connected by an arm, and the tip end and / or the root portion of the arm are rotatably configured. Speaker system. 3. The second baffle is configured to be detachable from the first baffle.
Alternatively, the speaker system according to claim 2.