JPH04358499A - Speaker equipment for low sound frequency reproduction - Google Patents

Abstract

PURPOSE:To realize the speaker equipment excellent in reproducing low frequency sound for reproducing low sound frequency for a television receiver. CONSTITUTION:A flange 25 at a speaker side 22 is provided to a front side cylinder box 23 of a speaker 21 for reproducing low frequency sound for a television receiver, and steps 28, 29 to which a frame 26 of the speaker 22 and paper 27 acting like a contact aid of the frame 26 are inserted and fixed are formed to a root of the flange 25. Moreover, a flange 30 at the side of the speaker 22 is provided to a rear side cylinder box 24 and a rib 31 to have the frame 26 of the said speaker 22 in between is provided in the inner diameter direction. The speaker 22 is supported by the steps 28, 29 of the front side cylinder box 23 and a rib 31 of the rear cylinder box 24, the flanges 25, 30 are tightened by a bolt and fitted.

Description

[Detailed description of the invention]

0001 [Purpose of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device for reproducing low frequency sounds with good reproduction of low frequency sounds.

0003

2. Description of the Related Art Conventionally, various types of speaker devices for reproducing bass sounds for TV have been considered. However, for space-saving designs, the width of TV cabinets is almost determined by the inch size of the cathode ray tube. That is, the width of the cathode ray tube of a TV is approximately 600 mm for a 29-inch size and approximately 510 mm for a 25-inch size. It has been difficult to produce a bass reproduction speaker device capable of reproducing good bass sounds within such a limited space and to fit it into a TV cabinet.

[0004] As a conventional speaker device for reproducing bass sounds for TV, there is one shown in FIGS. 6 and 7. Figure 6
is an exploded perspective view of the speaker, and FIG. 7 is a sectional view of the speaker device. This speaker device 1 for bass reproduction for TV has a paper 4 provided around the front surface of the frame 3 of the speaker 2 for abutment, and provided at the opening end of a cylindrical box 5 on the front side of the diaphragm 2a of the speaker 2. After temporarily installing the frame 3 and the arrow paper 4 on the stepped portions 6 and 7, the rear of the frame 3 is pressed by the end 9 of the cylindrical box 8 on the rear side of the diaphragm 2a of the speaker 2, and the cylindrical box 5 and the cylinder are pressed together. The box 8 is fastened with bolts 10, and the speaker 2 is attached and fixed. At this time, the TV bass reproduction speaker device 1 is separated by the speaker 2 into an airtight box 11 on the front side of the diaphragm 2a of the speaker 2 and a resonance box 12 on the rear side. Further, the resonance box 12 communicates with the outside through a resonance tube 13.

[0005] Similar to the above-mentioned loudspeaker, a speaker which improves bass reproduction characteristics by being separated into a resonance box on the front side of the speaker diaphragm and a closed box on the rear side is known, for example. One proposal has been made in Publication No. 152394.

[0006] The bass reproduction characteristics of a typical speaker device are as follows:
If the speaker diaphragm is supported soft enough,

[0007]

[Math 1]

It is given by: Here, ◎ fob: lowest resonant frequency ◎ mo: equivalent mass of the vibration system ◎ Co: compliance of the box as seen from the diaphragm ◎. In order to lower the bass range of the bass reproduction speaker device 1 for TV mentioned above and reproduce even better bass, the above formula (1
) In order to lower the lowest resonance frequency fob, it is necessary to increase the compliance Co or the equivalent mass mo of the vibration system. However, an increase in the equivalent mass mo of the vibration system causes a decrease in speaker efficiency, so the compliance of the box C
o, that is, it is necessary to increase the internal volume. However, since the TV cabinet has a limited width dimension, it is not possible to increase the internal volume of the cylindrical box by increasing the tube length.

Therefore, in order to increase the internal volume of the cylindrical box, the TV bass reproduction speaker device 14 shown in FIG.
An auxiliary ring 15 is provided on the speaker 2, and this auxiliary ring 1
5 is temporarily installed at the opening end of the cylindrical box 16 on the front side of the diaphragm 2a of the speaker 2, and then the rear of this auxiliary ring 15 is pressed by the end of the cylindrical box 17 on the rear side of the diaphragm 2a of the speaker 2. However, the speaker 2 is fixed by fastening and fixing the cylindrical box 16 and the cylindrical box 17 with bolts 10. At this time,
The TV bass reproduction speaker device 14 includes a speaker 2
and the auxiliary ring 15, the diaphragm 2a of the speaker 2
It is separated into a sealed box 18 located closer to the front and a resonance box 19 located closer to the rear. Further, the rear side resonance box 19 communicates with the outside through a resonance tube 20.

The TV bass reproduction speaker device 14 having the above-mentioned configuration is installed in the width direction of the rear surface of the cathode ray tube of the TV cabinet, so there is a limitation in the width dimension. In order to lower the lowest resonance frequency within this limitation, the diameters of the cylindrical boxes 16 and 17 were increased to increase the volume and the compliance Co. However, if the diameters of the cylindrical boxes 16 and 17 are increased as described above, the speaker 2 cannot be directly attached to the cylindrical boxes 16 and 17, so an auxiliary ring 15 is attached to the speaker 2 and the cylindrical box 16 and 17. That is, although the volume of the speaker device 14 can be increased by attaching the auxiliary ring 15 to the speaker 2, attaching the auxiliary ring 15 to the speaker 2 increases the cost and requires support for the speaker 2. There is a possibility that it may become stable.

[0011]

[Problem to be Solved by the Invention] As mentioned above, in the conventional bass reproduction speaker device, in order to lower the lowest resonance frequency, the diameter of the cylindrical box is increased to increase the volume and the compliance Co is increased. Ta. However, increasing the diameter of the cylindrical box requires an auxiliary link to attach the speaker, which not only increases cost but also makes the support of the speaker unstable.

The present invention eliminates the above-mentioned problem, and in order to lower the lowest resonance frequency, the diameter of the cylindrical box is increased without increasing the width of the cabinet, and the volume of the cylindrical box is increased. As well as increasing
It is an object of the present invention to provide a speaker device for reproducing bass sounds in which a speaker can be stably attached to the cylindrical box without using a speaker auxiliary ring.

[0013] [Structure of the invention]

[0014]

[Means for Solving the Problems] A speaker device for bass reproduction according to the present invention is a speaker device for bass reproduction in which a speaker is fixed between cylindrical boxes arranged on the front side and rear side of a speaker diaphragm, respectively. , the frame of the speaker is held between the open end of one cylindrical box on the speaker diaphragm side and the rib provided in the cylinder of the other cylindrical box, and the speaker is fixed.

[0015]

[Function] The bass reproduction speaker device having the above configuration is as follows:
Since the speaker is mounted by sandwiching the speaker frame between the open end of one cylindrical box on the speaker diaphragm side and the rib provided in the cylinder of the other cylindrical box, the diameter of either cylindrical box By making the volume larger than the diameter of the speaker, it is possible to improve the bass range.

[0016]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 relate to one embodiment of the present invention, and FIG.
FIG. 2 is an exploded perspective view showing a part of the speaker device with a cutaway.
is a cross-sectional view of the speaker device, and FIG. 3 is a characteristic diagram showing frequency characteristics.

As shown in FIGS. 1 and 2, the TV bass reproduction speaker device 21 has a diaphragm 22a of a speaker 22.
The speaker 22 is sandwiched between a cylindrical box 23 on the front side and a cylindrical box 24 on the rear side. The front cylindrical box 23 is provided with a flange 25 having a female thread for connection and fixation with the rear cylindrical box 24 on the speaker 22 side. and a stepped portion 2 for clamping and fixing the arrow paper 27 which is provided around the front surface of the frame 26 and serves as an abutment.
8 and 29 are provided. Further, the rear cylindrical box 24 is provided with a flange 30 having a female thread for connection and fixation with the front cylindrical box 23 on the speaker 22 side, and the inner wall of the rear cylindrical box 24 has, for example, , four ribs 31 are erected in the inner diameter direction. Furthermore, the anti-flange 30 of this rear side cylindrical box 24
The side end surfaces are closed, and a cylindrical resonance tube 32 is provided in the center thereof to extend inward in the axial direction. The speaker 2
2, the frame 26 and arrow paper 27 of the speaker 22 are held between the step portions 28 and 29 of the front cylindrical box 23 and the rib 31 of the rear cylindrical box 24, and the flange 2
5 and 30 are fastened and fixed by bolts 32. At this time, the TV bass reproduction speaker device 2
1 is connected to the diaphragm 2 of the speaker 22 by the speaker 22.
It is separated into a sealed box 33 on the front side of 2a and a resonance box 34 on the rear side.

The volume of the resonance box 34 on the rear side of the speaker device 21 having the above-described configuration can be freely adjusted by increasing the diameter of the rear cylindrical box 24 and changing the height of the rib 31 provided on the inner wall. Can be set to . That is, since the speaker 22 is held between the rib 31 on the inner wall of the rear cylindrical box 24 and the steps 28 and 29 provided on the front cylindrical box 23, the diameter of the rear cylindrical box 24 is smaller than the speaker frame 26. Even if it is made larger, it can be fixed without requiring an auxiliary ring. The front cylindrical boxes 23 and 24 are connected to each other.
This is made possible by enlarging the flanges 25 and 30 provided on the. Furthermore, when the inner diameter of the rear cylindrical box 24 is increased, the strength is greater than that of the frame 2 of the speaker 22.
The ribs 31 for holding 6 serve as reinforcing ribs and are therefore increased in size.

The speaker device 21 changes the diameter of the rear cylindrical box 24 to create a rear resonance box 3.
4 and the rear cylindrical box 24.
The ribs 31 provided on the inner wall of the rear cylindrical box 24
By increasing the intensity of the sound, it is possible to reproduce good bass sounds with less distortion.

FIG. 3 is a characteristic diagram showing the relationship between acoustic output and frequency of the present invention. The frequency characteristics of the embodiment of the present invention are represented by the solid line in the figure, and it can be seen that the lowest resonant frequency is low. Note that the broken line indicates the characteristics when the volume of the conventional speaker device is not increased.

FIG. 4 is a sectional view of a speaker device according to a modified example of the present invention. In this modification, the cylindrical resonance tube 32 provided in the rear cylindrical box 24 of the above embodiment is provided on the end surface of the front cylindrical box 23 on the side opposite to the speaker. Other constituent elements are the same as those in the above embodiment, and the same members are given the same reference numerals. It should be noted that the operation and effects are similar to those of the above embodiment.

As described above, the speaker device 21 for bass reproduction according to the embodiment of the present invention increases the volume of the cylindrical box by increasing the diameter in the diametrical direction without increasing the length, and reproduces bass in the bass range. Since it is considered to be in good condition,
As shown in FIG. 5, it can be placed in the space in the width direction on the back side of the cathode ray tube of the TV cabinet 41.

[0023]

Effects of the Invention As explained above, the speaker device for bass reproduction according to the present invention increases the diameter of the cylindrical box without increasing the width of the cabinet in order to lower the lowest resonant frequency. This has the effect of increasing the volume of the cylindrical box and allowing the speaker to be stably attached to the cylindrical box without using a speaker auxiliary ring.

[Brief explanation of drawings]

1 to 3 relate to one embodiment of the present invention, and FIG. 1 is an exploded perspective view showing a speaker device with a portion thereof cut away.

FIG. 2 is a sectional view of the speaker device.

FIG. 3 is a characteristic diagram showing frequency characteristics.

FIG. 4 is a sectional view of a speaker device according to a modification of the present invention.

FIG. 5 is a schematic explanatory diagram when a speaker device is installed in a TV cabinet.

6 to 8 relate to a conventional example, and FIG. 6 is an exploded perspective view of a speaker device.

FIG. 7 is a sectional view of the speaker device.

FIG. 8 is a sectional view of another example of a speaker device.

[Explanation of symbols]

21...Speaker device for bass reproduction 22...Speaker 23... Front side cylindrical box 24... Rear side cylindrical box 25...Flange 26...Frame 30...Flange 31...Rib 32... Resonance tube

Claims (1)

[Claims] Claim 1: In a speaker device for bass reproduction in which a speaker is fixed between cylindrical boxes arranged on the front side and the rear side of a speaker diaphragm, the open end of one cylindrical box on the side of the speaker diaphragm. 1. A speaker device for bass reproduction, characterized in that the speaker is fixed by sandwiching the frame of the speaker between the cylindrical box and the rib provided in the cylinder of the other cylindrical box.