JPH0332151Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a speaker device housed in a bass speaker storage box.

(Prior Art) Conventionally, as shown in FIG. 3, a duct 4 is provided at the lower part of a front bumper plate 3 of a cabinet 2 housing a cone speaker 1 for bass reproduction, and the phase of the sound emitted from the rear surface of the speaker cone is controlled. The so-called bass reflex type speaker cabinet 2 is designed to invert the sound and radiate it outward from the duct 4, aligning the phase with the sound radiated from the front of the speaker cone, thereby enhancing the bass characteristics. It was hot.

(Problem that the invention aims to solve) However, in such a bass reflex type cabinet 2, it is composed of sound sources at two points in the vertical direction with mutually uneven characteristics, and the radiated sound waves from the cone speaker 1 and the radiated sound waves from the duct 4 are are synthesized in the free space in front of the baffle plate 3 after being radiated. When sound waves with uneven characteristics are synthesized in free space in this way, there is a problem in that the localization position of the sound image changes depending on the reproduction frequency band and becomes disorganized, which is what is called poor localization of the sound image. .

(Means for Solving the Problems) This invention was made to solve the above-mentioned conventional problems, and will be described in detail below based on embodiments shown in the drawings.

As shown in the perspective view of FIG. 1 and the sectional view of FIG. 2, the speaker device includes a bass cone speaker 1.
1 is attached to a baffle plate 12 and housed inside the cabinet 10. Batsuful board 12
Inward partition plates 13a, 13b are connected to both sides of the cabinet 10, and left and right side plates 14a, 14 of the cabinet 10 are connected to each other.
A duct 15 is formed between the inner wall of b. The front plate 16 of the cabinet 10 is arranged parallel to and facing the baffle plate 12 on which the speaker 11 is attached at a predetermined interval, and has larger areas at both left and right ends corresponding to the ducts 15a and 15b. Equal slit-shaped left and right openings 17a, 17b
is formed. Full plate 12 and front plate 16
The distance between the two is determined by the volume surrounded by these, and this volume is based on the reproduction frequency band of the speaker 11, the opening area and volume of the duct 15, the area and volume of the opening 17, etc. It can be decided. As an example, when the reproduction frequency band of the bass speaker 11 is 40 to 150Hz, the bass full plate 1
Good results were obtained when the experiment was conducted with a distance of several centimeters between the front plate 16 and the front plate 16.

(Function) With this structure, the direct radiated sound from the front of the speaker 11 and the phase-inverted radiated sound from the back of the speaker 11 through the duct 15 are transmitted through the left and right openings 17a and 17b of the front plate 16. After being forcibly combined, it is released into the free space in front of the cabinet 10. Left and right openings 17a in symmetrical positions,
17b When sound waves with uniform characteristics are emitted, this sound image is localized at the center of the front plate 16. Speaker 11
Since sound waves are emitted from the left and right apertures 17a and 17b over the entire range of reproduction frequencies handled by the left and right openings 17a and 17b, and a sound image is localized, the localization position of the sound image will not change due to the difference in the reproduction frequency band, and the so-called sound image This prevents the image from spreading and becoming blurry, or from worsening its localization.

In addition, the volume between the front plate 16 and the buffer plate 12 serves as a high-cut filter (low-pass filter) for frequency components, and attenuates the high-frequency range outside the reproduced frequency band from the front of the bass cone speaker 11. The resulting harmonic distortion is also reduced.

Furthermore, the front plate 16 also functions as a protection plate for the cone speaker 11.

(Effects of the invention) As described above, according to this invention, after the sound radiated directly from the front of the cone speaker and the sound radiated through the duct from the back are forcibly combined inside the cabinet, the symmetrical aperture is Since it is made to radiate from the
The sound image can be localized to a single point in the center of the front panel, making it possible to reproduce a coherent sound.
Furthermore, it is possible to improve characteristics by attenuating harmonic distortion as well as frequency components outside the reproduction band, and it is also possible to protect the speaker cone.
Excellent practical effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a speaker device implementing this invention, FIG. 2 is a sectional view of the same, and FIG. 3 is a perspective view of a conventional speaker device. 10... Cabinet, 11... Cone speaker, 12... Full board, 13... Partition plate, 14
...Side plate, 15...Duct, 16...Front plate,
17...Opening.

Claims (1)

[Scope of utility model registration request] A cone speaker is attached to the buttful plate, the buttfull plates are arranged facing each other at a predetermined distance inside the front plate constituting the cabinet, and inward partition plates are connected to both left and right ends of the buttfull plate, and this partition plate and A speaker device in which a duct is formed between left and right side plates of a cabinet, and openings are provided on the left and right sides of a front plate corresponding to the openings of the duct.