CN100340133C

CN100340133C - Voice box

Info

Publication number: CN100340133C
Application number: CNB031403700A
Authority: CN
Inventors: 徐江
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-31
Filing date: 2003-08-31
Publication date: 2007-09-26
Anticipated expiration: 2023-08-31
Also published as: CN1516519A

Abstract

The present invention relates to a sound box which comprises a front and a back baffles, a speaker unit and a box casing, wherein the box casing is composed of a left baffle, a right baffle, a top plate and a bottom plate; the speaker unit is fixed to the box casing by a fixing device arranged on the box casing. Because the fixing device is fixed to the box casing, and rigid connection does not exist between the front and the back baffles; the vibration of the speaker unit can not be transferred onto the front and the back baffles, and baffles connected with the speaker unit can not vibrate almost. A box body of an ordinary medium and low-grade popular sound box is comparatively thin, and the interfere of the box body is obvious. With the adoption of the structure, the instant effect can be obtained quickly. For the medium and low-grade sound box, on the basis of original sound box, the positioning of a sound field can be accurate, more sound details can reoccur, and the performance can be better.

Description

A kind of audio amplifier

Technical field

The present invention relates to a kind of stereo set, specifically, relate to a kind of audio amplifier.

Background technology

As everyone knows, audio amplifier is the final tache in the whole sound system, and its playing quality is very big to the whole system performance impact.Estimate that by professional person in the row audio amplifier accounts for more than 30% of whole system to the contribution of whole sound system.

Along with the fast development of electronic technology, as the audiogenic device in the sound system, as CD player, DVD player etc. and amplifier, the existing at present leap greatly of its technical indicator reaches very perfect level.And as the final tache in the sound system, though the also development to some extent of loud speaker that uses in the audio amplifier and frequency divider, the progress of casing aspect is very slow always.

According to known viewpoint, a desirable audio amplifier should be a rigid structure, and when the loud speaker sounding, casing should not vibrate, in order to avoid generation sound dyes.Simultaneously, casing self also should have the damping coefficient and the acoustical reduction coefficient of appropriateness.

But the casing of traditional audio amplifier, manufacturing materials all are plank or medium airtight pane basically.These materials are not because its physical characteristic is not good enough, make to have three serious problems behind the sound box.First gear housing rigidity deficiency, loudspeaker unit brings out " the case sound " that very easily produces vibration down and send the interference original sound field in case; It two is that the acoustical reduction coefficient of casing is lower, and sound more easily sees through casing and destroys original sound field in the case; It three is to be difficult to make reasonably non-parallel face casing, thereby makes its frequency response curve significantly peak valley occur.

Above various shortcoming all can damage or disturb original sound field, makes the tonequality deterioration.And according to the interrelated data report, present audio amplifier more than 90% all has sound in various degree to dye, thereby forms the adverse consequences that different audio amplifiers has different individual characteies.

At these shortcomings, people begin to seek new solution.Mainly contain following approach:

1. strengthen the gear housing rigidity aspect:

(1) with the bigger material of thickness: as certain famous brand audio amplifier, preceding baffle adopts 76mm sheet material.Some are audio amplifier preferably, and preceding baffle thickness is also progressively thickeied 38mm by general 18mm.

(2) use new material: as using metal, cement, stone material and some resin materials etc.

2. change the sound box shape: make the form of non-parallel face, not only can improve gear housing rigidity, and can also reduce or eliminate the generation of standing wave.

3. strengthen the damping coefficient of casing self: as use sound-absorbing material preferably, even use wedge shape material.

Except above all effort, people have ignored a considerable problem: general audio amplifier, structurally, so loudspeaker unit all is directly to be fastened on the preceding baffle of audio amplifier with screw, the vibration that the time causes in work when loudspeaker unit, to act directly on the preceding baffle, thereby baffle also vibrate before causing by supporting structures such as basin framves.

From accompanying drawing 1 as can be seen, the residing plane of preceding baffle is generally all bigger, and the intensity of material is not high.And the direction of the power of loudspeaker unit generation vibration is vertical with preceding baffle.Can know that from the principle of mechanics the direction of this power is the easiest to make preceding baffle that disadvantageous vibration take place.Reaction force when vibration takes place for the voice coil loudspeaker voice coil of loudspeaker unit and cone acts on the preceding baffle 100%, thereby corresponding vibration takes place baffle before making, and sends case sound.

But because the acoustic characteristic of this case sound is inconsistent with the sound property that loudspeaker unit sends, thereby form so-called " casing interference ", make stereo bluring, details that can't reproduced sound has reduced the performance of audio amplifier.

Some production firms thoughts on this, also develop some and reduce the method for loudspeaker unit vibration to the influence of preceding baffle itself both at home and abroad.Monitor serial audio amplifier as external famous KEF, when loudspeaker unit is installed, be added with special soft rubber and isolate antihunting device, fix with " soft " property vibration damping between loudspeaker unit and the audio amplifier.Chinese patent CN 1112348A discloses a kind of balance sound box for another example, adopts the mechanical balance member to reduce the influence of loudspeaker unit vibration to preceding baffle.

But, adopt vibration absorber, just alleviate the influence of vibration to a certain extent, fundamentally do not deal with problems, and certain negative effect is arranged.

Summary of the invention

For remedying the defective of prior art, eliminate the influence of loudspeaker unit vibration to preceding baffle, disturb thereby eliminate casing, the present invention proposes a kind of audio amplifier, and the technical scheme of employing is as follows:

Audio amplifier of the present invention comprises forward and backward baffle, loudspeaker unit and tank shell, and tank shell is made up of left and right baffle and top, base plate.Loudspeaker unit is fixed on the tank shell with the fixture that is located on the tank shell, so loudspeaker unit and forward and backward baffle do not exist and be rigidly connected, and the vibration of loudspeaker unit can not be delivered on the forward and backward baffle.

Described fixture comprises at least one fixture, and at least one face of fixture and tank shell is connected, and loudspeaker unit is fixed on it, just in time packed in its loudspeaker unit position before in the perforate of baffle, but there is no rigid the contact with preceding baffle.

In order to reach vibration-isolating effect preferably, described fixture preferably links to each other with the shortest left and right baffle of spacing.

Fixture can adopt suitable materials such as steel plate, timber, and can be rectangle, circle or other shape.

The vibration that produces in when work from loudspeaker unit and the direction of power can know, the size of the reaction force of supporting structures such as basin frame and the power that voice coil loudspeaker voice coil produces under the function of current are equated that direction is opposite, but direction is all parallel with the sensing axle of loudspeaker unit.Like this, the direction of the power of coming from supporting structure transmission such as basin framves just with the direction almost parallel of left and right baffle.From the principle of mechanics as can be known, the power of this and left and right baffle almost parallel can cause the vibration of left and right baffle hardly.And, adopt this structure, just can make fixture reach enough rigidity with lower cost, the physical location of whole loudspeaker unit is changed hardly, the microphone device such as just voice coil loudspeaker voice coil and cone etc. of change.

This just brings two benefits: first benefit is that loudspeaker unit seems to be fixed on " rigidity " holder, the baffle that links to each other with loudspeaker unit can vibrate hardly, thereby significantly reduces because the case acoustic jamming that the loudspeaker unit vibration directly causes.Second benefit be, because back-up systems such as loudspeaker unit basin frame vibrate hardly, also reduced the loss in the electroacoustic transfer process, improved the loudness of sound equipment.

In addition, need to solve " sound is revealed " problem that the gap when installing causes.The way of its solution is also a lot, can adopt various prior aries to seal according to the price and the requirement of casing.

For the casing of popular style, can be directly with whippy fluid sealant such as glass cement, directly be filled on the gap between loudspeaker unit and preceding baffle and get final product.

For demanding audio amplifier, available high-elastic foamed plastics spare.Fill the gap of loudspeaker unit and preceding baffle earlier, the mode that can stick on one deck sealed film above realizes.

For the mass production method of factory, can precast the form of corresponding foam seal circle fully, be installed on the loudspeaker unit, loudspeaker unit and preceding baffle are sealed substantially, and then stick corresponding sealing ring, make sealing effectiveness better.

The present invention's beneficial effect against existing technologies is, because fixture is located on the tank shell, do not exist with forward and backward baffle and to be rigidly connected, the vibration of loudspeaker unit can not be delivered on the forward and backward baffle, and the direction of vibration of loudspeaker unit is parallel with left and right baffle, and therefore the baffle that links to each other with loudspeaker unit can vibrate hardly.General low and middle-grade popular audio amplifier, the casing major part is thinner, and casing disturbs obviously, adopts this structure can receive the effect of getting instant result.For medium-to-high grade audio amplifier, then can on original basis, make three-dimensional sound field accurate positioning, reappear more sound details, performance is attained a yet higher goal.

Description of drawings

Fig. 1 is vibrational state schematic diagram of preceding baffle of existing audio amplifier;

Fig. 2 is another vibrational state schematic diagram of preceding baffle of existing audio amplifier;

Fig. 3 is the structural representation of the preferred embodiments of the present invention;

Fig. 4 is the rearview of preferred embodiment shown in Figure 3.

Embodiment

Below in conjunction with accompanying drawing a preferred embodiment of the present utility model is elaborated.

Audio amplifier among this embodiment comprises preceding baffle 1, back baffle 2, tank shell, fixture and loudspeaker unit 3.

Tank shell is made up of left baffle 4, right baffle 5, top board 6 and base plate 7.

Fixture comprises left fixture 8 and right fixture 9, is located at respectively on left baffle 4 and the right baffle 5.

Left fixture 8 of loudspeaker unit 3 usefulness and right fixture 9 are fixed in the tank shell, and before just in time can being packed in the position of its loudspeaker unit 10 in the perforate of baffle 1, but loudspeaker unit 10 and preceding baffle 1 no rigid the contact.

Fill with glass cement 11 1 of loudspeaker unit 10 and preceding baffle, seal.

This embodiment only needs to change slightly on the basis of original audio amplifier, just can realize that effect is obvious, is beneficial to popularization.

The above only is a preferred embodiment of the present invention, is not to be used for limiting practical range of the present invention; Be all equivalents of being done according to claim scope of the present invention, be claim scope of the present invention and cover.

Claims

1, a kind of audio amplifier, comprise forward and backward baffle, loudspeaker unit and tank shell, tank shell is made up of left and right baffle and top, base plate, and loudspeaker unit is fixed on the tank shell with the fixture that is located on the tank shell, just in time can be packed in its loudspeaker unit position before in the perforate of baffle; Fixture comprises at least one fixture; It is characterized in that the shortest left and right baffle of described fixture and spacing links to each other.

2, audio amplifier as claimed in claim 1 is characterized in that sealing with flexible sealing material between described loudspeaker unit and preceding baffle.

3, audio amplifier as claimed in claim 2 is characterized in that described flexible sealing material is a glass cement.

4, audio amplifier as claimed in claim 2 is characterized in that described flexible sealing material comprises foamed plastics spare and sealed film.