CN2288564Y

CN2288564Y - Loadspeaker box

Info

Publication number: CN2288564Y
Application number: CN 97202774
Authority: CN
Inventors: 沙占起; 沙占为
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-03-28
Filing date: 1997-03-28
Publication date: 1998-08-19
Anticipated expiration: 2007-03-28

Abstract

The utility model relates to a sound box which can be directly used in a high-fidelity sounding device. The utility model is characterized in that the utility model uses a hole net partition plate as a core, and a box body is reinforced; the sound box forms a multi-sound chamber air resistance type structure, and that is to say, a low sound chamber, a middle sound chamber, a high sound chamber, an air resistance chamber, a sound absorbing chamber and a sound supporting chamber are formed, wherein, the air resistance damping characteristic of the air resistance chamber improves the operating state of a speaker, decreases transient distortion and harmonic distortion, improves radiation sound pressure, expands low frequency, eliminates the resonance of standing waves and the box body, realizes the high fidelity of the sound box, enlarges the select range of the speaker, decreases the volume and reduces the cost.

Description

A kind of audio amplifier

The utility model relates to a kind of audio amplifier, the audio amplifier in particularly a kind of high-fidelity audio equipment.

In stereo set, the task of audio amplifier is to do electricity, sound conversion, and sound is reproduced.Audio amplifier is made up of casing, loud speaker, sound-absorbing material etc.In existing speaker products, adopt enclosed construction or inverted phase type structure more.The advantage of closed audio amplifier is: manufacture craft is simple, and distortion is little, and volume is little, and cost is low.Shortcoming is: LF-response is poor, and efficient is low, and sound radiation pressure is little.Because when diffuser is done porpoise, the air in the casing can add an additional elastic force to cone as the air that is enclosed in the air spring, and the stiffness of speaker vibration system is strengthened, and causes resonance frequency to raise the LF-response variation.Because the energy of loud speaker rear portion radiation is closed, consume in the sound-absorbing material in casing, so efficient is low, sound radiation pressure is little.The advantage of phase inverted cabinet is: the efficient height, and sound radiation pressure is big, and LF-response is good.Shortcoming is: distortion is big, and volume is big, and the cost height is easy to generate the resonance of standing wave and casing.Reason is the ad hoc structure of phase inverted cabinet, and pilot hole also contains clutter frequencies such as high order harmonic component, modulating wave, standing wave, resonance wave simultaneously except that the frequency of sound wave at radiation loud speaker rear portion, and distortion is strengthened.And the ubiquitous shortcoming of speaker products is at present: the size of transient distortion relies on the mechanical compliance of loud speaker itself and damping situation to decide fully, and the range of choice of loud speaker is diminished, and cost increases.

The purpose of this utility model provides a kind of audio amplifier, and it can reduce transient distortion and harmonic distortion effectively, improves sound radiation pressure, and expansion low-frequency reduces volume, reduces cost, and eliminates the resonance of standing wave and casing.

For finishing the invention task, the audio amplifier of the utility model design is by casing, the sound-absorbing material of loud speaker and casing liner is formed, the low tone chamber that has hole pattern dividing plate and hole pattern dividing plate to be separated in the casing, in, high tone chamber, the vapour lock chamber, anechoic room and help the tone chamber, low tone chamber is positioned at the audio amplifier stage casing, install woofer on its header board, the hole pattern dividing plate back of vertically-arranged is an anechoic room behind the woofer, low tone chamber and helping between the tone chamber of audio amplifier one end are the vapour lock chambers, help on tone chamber's header board and install guide pipe, in, high tone chamber places the audio amplifier other end, in being provided with on its header board, high pitch loudspeaker.

The utility model audio amplifier is separated into low tone chamber, middle and high tone chamber, vapour lock chamber, anechoic room and helps the tone chamber with the hole pattern dividing plate, make audio amplifier form multitone chamber air-resistance type structure, and suitably select the height and the absorption of vapour lock chamber, make the vapour lock damping characteristic act on loud speaker, loud speaker is worked in the best condition.When diffuser is done porpoise, the radiative acoustic wave at loud speaker rear portion produces a pressure in the vapour lock chamber, this pressure feed back to low tone chamber and in, high tone chamber, shortened the stable state time of loudspeaker network, reduced the transmitted waveform distortion that causes because of mass inertia, it is transient distortion, the radiative acoustic wave at loud speaker rear portion is except that bass frequencies simultaneously, during other frequency is reached by anechoic room, high tone chamber, the vapour lock chamber, help the sound-absorbing material in the tone chamber to absorb, reduced the harmonic distortion that other frequency radiation produces, bass frequencies are because wavelength is long, give off by the guide pipe that helps the tone chamber through the vapour lock chamber, sound radiation pressure is promoted, because the vapour lock damping characteristic of vapour lock chamber, the resonance frequency of loud speaker is reduced, the bass frequency range is raised 5-7dB, and low frequency has obtained expansion, and has strengthened the range of choice of loud speaker, reduce volume, reduced cost.Because the vapour lock damping action of vapour lock chamber and the internal structure of audio amplifier make standing wave not possess the generation condition.Because the reinforcement effect of hole pattern dividing plate has increased the rigidity of casing, so casing can not produce resonance.

As most preferred embodiment, the bore that the width of the casing of the utility model multitone chamber air-resistance type audio amplifier can be woofer adds the 20-100 millimeter, and wide, high, the thick ratio of casing is 1: 2.5: 1.And the height of low tone chamber is the bore of institute's dress woofer, the depth ratio of low tone chamber and anechoic room thereafter is 5: 3, the height of vapour lock chamber is the 30-80 millimeter, the internal diameter of guide pipe is 0.2-0.3 a times of woofer bore, length is 1/3rd of casing thickness, and guide pipe is the 20-90 millimeter apart from the hole pattern dividing plate of its top.

In order to ensure effect, the aperture of the through hole on the hole pattern dividing plate in the utility model audio amplifier can be the 17-21 millimeter, and the pitch-row between each hole is 1.6-1.9 a times of aperture.

Embodiment describes the utility model below in conjunction with accompanying drawing.

Fig. 1 is the utility model embodiment multitone chamber air-resistance type loudspeaker box structure schematic diagram.

Fig. 2 is the vertical profile schematic diagram of Fig. 1.

As shown in Figure 1 and Figure 2, be separated into middle and high tone chamber 9, low tone chamber 6, anechoic room 7, vapour lock chamber 4 and help tone chamber 1 with hole pattern dividing plate 14,8,5 and 3 in the casing 11 of the utility model one embodiment multitone chamber air-resistance type audio amplifier.There is middle and high sound loud speaker 13 to place middle and high tone chamber 9 on the header board 12 of casing 11, has woofer 15 to place low tone chamber 6, have guide pipe 16 to place and help tone chamber 1.This audio amplifier uses the woofer of 200 millimeters bores, the sheet metal thickness of the casing 11 of audio amplifier is 15 millimeters, and the width of casing 11 is 240 millimeters, highly is 600 millimeters, thickness is 240 millimeters, the height of low tone chamber 6 is 200 millimeters, and the degree of depth of low tone chamber 6 is 126 millimeters, and the degree of depth of anechoic room 7 is 69 millimeters, the height of vapour lock chamber 4 is 35 millimeters, the internal diameter of guide pipe 16 is 50 millimeters, and length is 80 millimeters, and the distance between the hole pattern dividing plate 3 of guide pipe 16 and its top is 25 millimeters.The aperture of the through hole 10 on the hole pattern dividing plate 14,8,5 and 3 is 20 millimeters, and pitch-row is 35 millimeters.Middle and high tone chamber 9 inwalls, anechoic room 7 inwalls in the casing 11 and help tone chamber 1 and vapour lock chamber 4 all is filled with sound-absorbing material 17 on the wall within as shown in Figure 2.On the casing 11 back plates 2 wiring hole 18 is arranged.

Claims

1, a kind of audio amplifier, by casing, the sound-absorbing material of loud speaker and casing liner is formed, it is characterized in that having in the said casing hole pattern dividing plate to reach the low tone chamber that is separated with the hole pattern dividing plate, in, high tone chamber, the vapour lock chamber, anechoic room and help the tone chamber, low tone chamber is positioned at the audio amplifier stage casing, install woofer on its header board, the hole pattern dividing plate back of vertically-arranged is an anechoic room behind the bass loudhailer, low tone chamber and helping between the tone chamber of audio amplifier one end are the vapour lock chambers, help on tone chamber's header board and install guide pipe, in, high tone chamber places the audio amplifier other end, in being provided with on its header board, high pitch loudspeaker.

2, audio amplifier according to claim 1, it is characterized in that, the width of said casing adds the 20-100 millimeter for the woofer bore, wide, high, the thick ratio of casing is 1: 2.5: 1, the height of said low tone chamber is the bore of woofer, the depth ratio of low tone chamber and anechoic room thereafter is 5: 3, the height of vapour lock chamber is the 30-80 millimeter, the internal diameter of guide pipe is 0.2-0.3 a times of woofer bore, length is 1/3rd of casing thickness, and guide pipe is the 20-90 millimeter apart from the hole pattern dividing plate of its top.

3, audio amplifier according to claim 1 and 2 is characterized in that the aperture of the through hole on the hole pattern dividing plate in the said casing is the 17-21 millimeter, and pitch-row is 1.6-1.9 a times of aperture.