CN2744104Y

CN2744104Y - Omnidirectional loudspeaker

Info

Publication number: CN2744104Y
Application number: CN 200420071766
Authority: CN
Inventors: 王永明
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-19
Filing date: 2004-07-19
Publication date: 2005-11-30
Anticipated expiration: 2014-07-19

Abstract

The utility model relates to an omnidirectional loudspeaker which can radiate sound waves in 360 degrees. The omnidirectional loudspeaker is provided with an omnidirectional cover which is matched with the diaphragm accurately in front of the diaphragm of the common loudspeaker. A turning space is formed between the omnidirectional cover and the diaphragm. The pushing (/pulling) force generated by the vibration of the diaphragm is transferred to the exterior space by the transferring action of the air in the turning space to push (/pull) the air in the exterior space to vibrate and produce sound. At the same time, the force direction is altered in the transferring process,and the radiation of the sound waves to the space of 360 degrees is realized.

Description

The full loudspeaker that point to

Technical field

It is the electroacoustic transducer of sound with electrical signal conversion that the utility model relates to a kind of, especially can realize the full sensing loudspeaker to 360 degree space radiation sound waves.

Background technology

According to U.S. BOSE company directly/principle of reflection, in the sound that loudspeaker are reset, hear good presence, in the sound that the hearer hears, also must comprise a large amount of reflected sounds except having directly to pass to the direct sound of people's ear by loudspeaker.Accomplish this point just require employed loudspeaker at least can be simultaneously to the sound wave of opposite both direction radiation homophase.And traditional loudspeaker forward, the sound wave of rear radiation is reverse, so centering, loudspeaker can only effectively be utilized the sound wave of an one direction.Therefore traditional loudspeaker can't provide enough reflective sound waves to reproduce good presence.De Guo MBL company is by improving the moving-coil loudspeaker for this reason, and having made can be to the full sensing loudspeaker of 360 degree space radiation sound waves.Its operation principle such as accompanying drawing 4 roughly: voice coil loudspeaker voice coil (4) up-down vibration in magnetic gap drives vibrating diaphragm (2) vibration, but this moment is because the lower end of vibrating diaphragm is fix inactive, so can only do horizontal vibration by increasing or reducing curvature.In Fig. 4, center line left side solid line and dotted line are illustrated the voice coil loudspeaker voice coil state of vibrating diaphragm, vibrational state of vibrating diaphragm as can see from Figure 4 behind bottom offset and before the displacement respectively.Be combined into drum shape by vibrating diaphragm and reach purpose to 360 degree space radiation sound waves with strip.But shape by comparison diagram 4 center line left side solid lines and dotted line, be not difficult to find when voice coil loudspeaker voice coil moves down, C part vibrating diaphragm moves down, D partly is moved to the left, with respect to surrounding air, C part reducing atmospheric density the D part increasing atmospheric density, so the phase place of the sound wave of this two parts vibrating diaphragm space radiation towards periphery is opposite.It requires the hardness of vibrating diaphragm very moderate as can be known to analyze the principle of this design simultaneously, and difficult promotion the really up to the mark crossed soft D part and may do not vibrated, and this all is difficult to realize the purpose of this design, so loudspeaker unit cost that should design is higher.

Summary of the invention

The purpose of this utility model is to improve traditional loudspeaker cheaply, to reach the full sensing purpose to 360 degree space radiation sound waves.

The operation principle that the utility model points to loudspeaker entirely is: omnidirectional's cover is installed before the vibrating diaphragm of common loudspeaker.Omnidirectional's cover is installed at interval with vibrating diaphragm, has just formed a space like this between omnidirectional's cover and vibrating diaphragm---and be referred to as to turn to the space, this turns to the air capacity in the space to adjust by the distance of adjusting between omnidirectional's cover and vibrating diaphragm.During design, need to adjust the air capacity that turns in the space, make the actuating force of the highest audio of its air compliance in the design bandwidth.Like this, when vibrating diaphragm vibration pushes away (/ draw) when turning to the air the space in, because being not enough to counteracting, the air compliance pushes away (/ draw) power, so just by turning to the space to be delivered to the air that space outerpace pushes away (/ draw) space outerpace, make the air vibration of space outerpace, thereby externally the space forms sound wave.The direction that changes and push away (/ draw) in transmittance process is to realize full sensing.

Described omnidirectional cover also can be to point to cover at any angle, to reach the purpose of control loudspeaker directive property.

Described common loudspeaker can be loudspeakers, also can be mediant trumpets.

The utility model points to the horn designs science entirely, and is simple in structure, has the following advantages:

1,, can realize the full sensing of 360 degree cheaply because the parts that increase are few;

2, can reduce the high-frequency harmonic distortion.Because quality is arranged is inert element to air, is both and has compliance to be compressed, so turn to air in the space can play the effect of low pass filter.Turn to the air capacity in the space to control low-pass characteristic by accurate adjusting, can eliminate the harmonic distortion that part surpasses effective frequency range;

3, can reduce by cutting apart the distortion that vibration produces.Since to around radiation sound wave reflection be that the whole actuating force that turns to the space to be subjected to changes, and it is different even on the contrary to cut apart the vibration phase that vibrate different parts, shows on the total amount it is constant, so this part sound wave can not be radiated outside the space;

4, can be made into the sensing loudspeaker of special angle easily.Need by controlling the opening angle of omnidirectional's cover, can not be made into easily and point to loudspeaker at any angle with the full place of pointing to.

The concrete structure that the utility model points to loudspeaker is entirely provided in detail by the following drawings and embodiment.

Description of drawings

Fig. 1 is that full pointing technology is used in the structural representation on the high pitch;

Fig. 2 is that full pointing technology is used in the structural representation on the middle pitch;

Fig. 3 is that full pointing technology is used in two structural representations on the symmetrical middle pitch that drives;

Fig. 4 is the full sensing horn structure schematic diagram of MBL;

Fig. 5 uses full pointing technology to make the structural representation that 120 degree point to high pitch;

Fig. 6 is the A-A cutaway view of Fig. 5;

Among the figure: 1. omnidirectional covers, and 2. vibrating diaphragm 3. turns to the space, 4. voice coil loudspeaker voice coil

Embodiment

Embodiment 1: Fig. 1 is the example that utilizes full pointing technology on high pitch.Part among Fig. 1 except that omnidirectional's cover (1) is that a common ball is risen sound.Omnidirectional's cover that accurately cooperates with tweeters diaphragms (2) and the space between vibrating diaphragm form and turn to space (3).Turn to air stiffness in the space by adjustment, the power that makes the vibrating diaphragm vibration promote air can be sponged by the air compliance that transmits and be unlikely to be diverted in the space, vibrates so just can be delivered to space outerpace by turning to the space.When vibrating diaphragm vibrates, will push away (/ draw) and turn to the air in the space.Can do not sponged owing to turn to the air stiffness space in enough to push away greatly consequently (/ draw) power,, push away the air that (/ draw) moves space outerpace so (/ draw) power that just will push away is delivered to space outerpace by the air compliance.So just can drive the ambient air vibration, reach steering-effecting and realize the full purpose of pointing to.

Embodiment 2: Fig. 2 is the example that utilizes full pointing technology on middle pitch.Part among Fig. 2 except that omnidirectional's cover (1) is a common middle pitch.Its operation principle and on high pitch the utilization full pointing technology operation principle just the same.

Embodiment 3: Fig. 3 is that full pointing technology is used in two examples on the symmetrical middle pitch that drives.Be equivalent to the full sensing middle pitch symmetry work of two examples 2.

Embodiment 4: shown in Figure 5 is to use full pointing technology to make 120 degree sensing high pitchs.This moment omnidirectional cover no longer be around opening, but the scope inner openings of 120 degree forwardly only so just can be controlled the directional property of loudspeaker.

Claims

1, a kind of can 360 the full sensing loudspeaker of degree radiative acoustic waves, it is characterized in that:

A, before common Loudspeaker diaphragm, install one and cover with the omnidirectional that vibrating diaphragm accurately cooperates;

B, omnidirectional's cover are installed at interval to form with vibrating diaphragm and are turned to the space.

2, full sensing loudspeaker according to claim 1 is characterized in that: two loudspeaker symmetries are installed in same omnidirectional cover two sides and form the symmetry driving.

3, loudspeaker according to claim 1 is characterized in that: omnidirectional's cover is that the directional property of the opening of control with the control loudspeaker arranged.