JPH04175098A - Speaker device - Google Patents

Abstract

PURPOSE:To obtain excellent reproducing characteristics for low frequency sound and flat frequency resonse characteristics by providing a fourth opening leading to the outside of a cabinet main body in second space and installing a passive radiator shutting high frequency waves in the fourth opening. CONSTITUTION:A speaker unit 3 is attached to a first opening provided on a baffle plate 2. First space 6 in a cabinet main body 1 is formed at the back side of the speaker unit. Second space 7 is formed in the cabinet main body 1 by the first space 6 and a separating plate 5 provided with a second opening 8. A third space 9 leading to the cabinet main body 1 is formed in the second space 7. A fourth opening 10 leading to the outside of the cabinet main body 1 is further provided in the second space 7. A passive radiator shutting the high frequency waves is installed in the fourth opening 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improving the characteristics of a speaker device.

[Prior Art] Figures 5(a) and 5(b) are a front view and a cross-sectional view of a conventional speaker device disclosed in, for example, Japanese Patent Application Laid-open No. 48-52220, and in these figures, (1) is A cabinet main body, (2) a baffle plate on the front thereof, (3) an interior speaker unit, (4) a first opening provided in the baffle plate for attaching the speaker unit (3), (5) ) is a partition plate that divides the inside of the cabinet body (1) into an upper first space (6) and a lower second space (7), and (8) is a second opening opened in this partition plate. Part (9) is a third opening that communicates the second space (7) with the outside of the cabinet body (1).

FIG. 6 is a mechanical equivalent circuit diagram of the speaker device shown in FIG. 5, where Z is the impedance of the speaker unit (3), Z is the radiation impedance of the speaker unit (3), and ra and sa are the The equivalent resistance and stiffness determined by the first space (6), m2 which becomes z2, r2 are the equivalent mass and equivalent resistance of the second opening (8) provided in the partition plate (5), rb and sb are equivalent resistance and stiffness determined by the second space (7), and 2. m,,r.

are the equivalent mass and equivalent resistance of the third opening (9) provided in the baffle plate (2) and communicating the second space (7) with the outside of the cabinet body, and z4 is the equivalent resistance of the third opening (9). It represents radiation impedance.

The above-mentioned conventional speaker device is represented by an equivalent circuit diagram as shown in FIG. Equivalently expressed in terms of power consumption. And compared to the case of a normal bass reflex system without the second opening (8), the number of orders of the low-pass filter for the sound radiated from the third opening (9), which is regarded as a bass reflex port, can be increased. It becomes possible to suppress unnecessary midrange sound emission from the boat,
Higher quality sound reproduction is possible.

In addition, compared to the case of a normal bass reflex system, the anti-resonance frequency can be set lower because the port part is configured in two places, the second opening (8) and the third opening (9). This is said to be able to increase the playback volume of bass sounds.

[Problems to be Solved by the Invention] However, when attempting to reproduce bass sounds beyond the normal bass reflex system with the above configuration, the sharpness Q of the resonance is abnormal near the high cutoff frequency of the low pass filter configured in the 1-equivalent circuit. , the sound pressure suddenly increases as shown in Figure 7 when the sound is emitted from the third opening (9),
This is due to a sudden phase shift with the sound radiated from the speaker unit (3).

There was a problem in that an abnormal dip occurred in the sound pressure response.

The speaker device of this invention was made to solve the above problems, and while realizing bass reproduction that is better than that of a normal bass reflex system, it also reproduces low frequencies near the high cutoff frequency from the third opening (bass reflex port). It is an object of the present invention to provide a speaker device that can suppress only a sudden increase in sound pressure in the , reduce the phase shift to a low frequency range, and obtain a flat frequency response characteristic.

[Means to solve the problem] A speaker device according to a first aspect of the present invention is as follows.

A fourth opening (10) communicating with the outside of the cabinet body is provided in the second space, and a passive radiator (11) for cutting off high frequencies is installed in this fourth opening (lO).

Further, in the speaker device according to the second aspect of the present invention, a foam (lla) serving as an acoustic resistance against high frequencies is attached to a similar fourth opening (10).

[Function] In the speaker device which is the first invention of this invention, the fourth
A high-frequency cutoff passive radiator provided in the opening of the radiator suppresses a sudden increase in sound pressure near the high cutoff frequency, resulting in a flat frequency response characteristic.

Moreover, in the speaker device which is the second invention of this invention,
The foam provided in the fourth opening and serving as an acoustic resistance to high frequencies suppresses a sudden increase in sound pressure near the high cutoff frequency, and similarly provides a flat frequency response characteristic.

[Example] An example of the first aspect of the present invention will be described below. That is, in FIGS. 1 and 2, the same or equivalent parts as those in FIGS. 5 and 6 will be given the same reference numerals, and redundant explanation thereof will be omitted. In this case, a fourth opening (10) communicating with the outside of the cabinet body (1) is further opened in the second space (7),
This fourth opening (10) has a resonance frequency determined by the second opening (8), the third opening (9), the first space (6), and the second space (7). It is characterized by the fact that it is equipped with a passive radiator (11) set near the high cutoff frequency.

That is, FIG. 2 is a mechanical equivalent circuit diagram of the speaker device according to the first aspect of the present invention, where zo is the impedance of the speaker unit (3), Zl is the radiation impedance of the speaker unit (3), and ra and sa are 1st
The equivalent resistance and stiffness determined by the space (6),
In addition, m2 and r2, which is z2, are the equivalent mass and equivalent resistance of the second opening (8) provided in the partition plate (5), and r
b and sb are the equivalent resistance and stiffness determined by the second space (7), and m3 and r3, which are similarly za, are provided in the panfur board (2) and connect the second space (7) to the outside of the cabinet body (1). The equivalent mass and equivalent resistance of the third opening (9) communicated with the third opening (9), and z4 are the radiation impedance of the third opening (9), especially 2. is the second space (
The equivalent mass m6, the equivalent stiffness S, and the equivalent resistance rs of the high frequency cutoff passive radiator (11) in the first aspect of the present invention attached to the fourth opening (10) in 7) be.

As can be seen from the circuit diagram in Fig. 2, by adding the passive radiator (11), zs is connected in parallel to 2° and Z, and the resonance of the response at the high cutoff frequency becomes sharp. It becomes possible to keep the degree Q low, and it becomes possible to suppress a sudden increase in sound pressure and a sudden change in phase.

Furthermore, FIGS. 3 and 4 show an embodiment of the speaker device according to the second aspect of the present invention, in which the second space (7) is further provided with a fourth opening communicating with the outside of the cabinet body (1). A section (10) is opened, and the resonant frequency of this fourth opening (10) is the same as that of the second opening (8), the third opening (9), the first space (6) and the second space. A foam (lla) is attached that is set near the high cutoff frequency determined by the space (7) and serves as an acoustic resistance.

That is, by adding the above-mentioned foam (lla), the equivalent mass m6, equivalent resistance r5, and acoustic resistance r are increased as shown in FIG.
An equivalent resistance Zs consisting of This means that sudden changes can be suppressed.

[Effects of the Invention] As described above, the first invention and the second invention of the present invention further provide a fourth opening in the second space, and a high-frequency cutoff passive is provided in the fourth opening. By installing a radiator or a foam material that acts as an acoustic resistance to high frequencies, it is possible to suppress the sudden sound pressure rise and phase change at the high cutoff frequency of the sound radiated from the third opening, resulting in a good sound. A speaker device with good bass reproduction and frequency characteristics can be obtained.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are a front view and a sectional view of a speaker device according to the first invention, FIG. 2 is an equivalent circuit diagram of the speaker device shown in FIG. 1, and FIG. B) is a front view and a sectional view of a speaker device according to the second invention of the present invention, FIG. 4 is an equivalent circuit diagram of the speaker device of FIG. 3, and FIGS. 5(A) and (B) are a conventional speaker device. 6 is an equivalent circuit diagram of the speaker device shown in FIG. 5, and FIG. 7 is a sound pressure characteristic diagram of the sound radiated from the third opening in the conventional speaker device. 6 In the diagram, (1) is the cabinet body, (2) is the baffle plate, (3) is the speaker unit, (4) is the first opening, (5) is the partition plate, and (6) is the first space. , (7) is the second space, (8) is the second opening, (9) is the third opening, (10) is the fourth opening, (11) is the passive radiator, (lla) is a foam that provides acoustic resistance. Other same numbers in the figures indicate the same or corresponding parts f/I
iIWI No. 7 Figure circumference (Hl) 9.147':'d Procedural amendment (method) % formula % 1. Indication of case 1990 Patent Application No. 301032
No. 2, Title of the invention Speaker device 3, Representative of the person making the amendment Moriya Shiki 4, Agent 5, Date of amendment order February 12, 1991 (
Shipping port) 6. Drawing subject to correction Figure 3

Claims (1)

[Scope of Claims] (1) A speaker unit is attached to a first opening provided in a baffle plate, a first space is formed in the cabinet body at the back thereof, and this first space and the second opening are connected to each other. a second space partitioned within the cabinet main body by a partition plate provided with a section, and a third opening communicating with the outside of the cabinet main body is formed in the second space; A speaker device characterized in that a fourth opening communicating with the outside of the cabinet body is further provided in the second space, and a passive radiator for cutting off high frequencies is attached to the fourth opening. (2) The speaker device according to claim 1, wherein the vibration area of the passive radiator provided in the fourth opening is in the range of 20% to 50% of the vibration area of the speaker unit. (3) A speaker unit is attached to a first opening provided in a baffle plate, a first space is formed in the cabinet body at the back thereof, and a partition plate is provided with this first space and a second opening. a second space partitioned within the cabinet body by a second space, and a third opening communicating with the outside of the cabinet body is formed in the second space, further comprising: A speaker device characterized in that a fourth opening communicating with the outside of the cabinet body is provided, and a foam material serving as an acoustic resistance against high frequencies is attached to the fourth opening. (4) Claim 3, wherein the area of the fourth opening is within 10% of the vibration area of the speaker unit at most.
The speaker device described in section.