JPH0115274Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is capable of emitting sound waves in multiple directions by attaching it to the front of the speaker unit of an audio device with a loudspeaker, such as a portable radio cassette recorder or an audio speaker system. It is used to construct a wide-area directional speaker.Specifically, it is a device that can be fixed to the front of the speaker unit coaxially or almost coaxially with the speaker unit and can be expanded and contracted along the direction of the sound emission axis, and can be fixed so that the sound emission axis can be bent. The present invention relates to a speaker horn constructed by attaching a bellows body in a state of

[Conventional technology]

The speaker horn configured as described above can improve the directionality of sound waves by fixing the bellows body in an elastic and flexible manner as appropriate depending on the sound listening conditions such as the shape of the sound field, its width, the number of people in the audience, and the purpose. It has the effect of being able to vary the directional characteristics over a wide range by being able to freely adjust the directional characteristics in three dimensions and freely adjusting the sound wave reach distance.Speaker horns that exhibit such a wide range of directional characteristics are, for example, special request
No. 59-210938, etc., which the present applicant previously developed and filed a patent application for. However, this type of speaker horn according to the earlier application was composed of the above-mentioned bellows body alone.

[Problem that the invention attempts to solve]

In a speaker horn constructed from such a single bellows body, the inner surface of the horn becomes a discontinuous surface with many unevenness in both the maximum extension state and the intermediate extension state, so that the sound waves entering from the throat part are affected by the unevenness. If the horn is bent further, the effect of the reflection will become even stronger, resulting in large peaks and dips, causing significant disturbances in the sound pressure frequency characteristics, as well as lowering the efficiency of the low range, making it difficult to achieve the desired horn. There was a problem with not being able to achieve the desired effect.

[Means for solving problems]

In view of the above circumstances, the present invention has an object to provide a speaker horn which can sufficiently exhibit wide directional characteristics by using a bellows body, and which can avoid problems such as those described above due to reflections as much as possible. The speaker horn according to the present invention devised to achieve the object has the structure described in detail at the beginning, and includes a cylindrical membrane that can be elastically expanded and contracted within the bellows body within the maximum expansion and contraction range of the bellows body. It is characterized by a structure in which only both ends in the direction of the cylinder axis are fitted into the throat portion and opening of the bellows body in a fixed position.

[Function] According to the speaker horn according to the present invention having the characteristic configuration as described above, the directionality of the sound waves and the sound wave travel distance can be adjusted according to the shape of the sound field space, sound listening conditions such as wideness and narrowness, and the purpose. When the bellows body is expanded, contracted and bent in order to exhibit a wide range of directivity characteristics, the cylindrical membrane fitted inside the bellows body with only both ends fixed in position becomes elastic according to the amount of expansion, contraction and bending displacement. The inner surface of the bellows body can be maintained as a smooth continuous surface regardless of the degree of extension or degree of bending.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

1 to 3, reference numeral 4 denotes a horn attached to the front of the speaker unit 1 for medium and high frequencies in a two-way two-speaker speaker system as shown in FIG. The speaker unit 1 is coaxially or nearly coaxially expandable and fixed along the direction of the sound emission axis from the speaker unit 1, and the sound emission axis can be bent and fixed. (conical shape) bellows body 2
and an elastically expandable cylindrical membrane 3 fitted within the bellows body 2. As clearly shown in FIG. 3, the bellows body 2 is blow-molded with a scalene triangular annular body 2C continuous in the axial direction in its cross-sectional shape along the axial direction, and the cylindrical membrane 3 is made of, for example, thin-walled synthetic rubber, which can elastically expand and contract while maintaining a smooth continuous surface in the maximum expansion and contraction range between the maximum extension state and the maximum contraction state of the bellows body 2, and preferably, the entire inner circumferential surface thereof is is smoothed by Teflon processing or the like, and its both ends in the cylinder axis direction are fixed in position to the inner surface of the throat portion 2A and the inner surface of the opening 2B of the bellows body 2 by heat welding means, and the intermediate portion is It is free for

In the buckle plate 6 of the enclosure 5 in the speaker system, the portion corresponding to the front surface of the speaker unit 1 can be stored so that it does not protrude forward as shown in FIG. 2 when the horn 4 is contracted to the maximum. The throat portion 2 of the bellows body 2 is formed so that the horn 4 can freely bend within three dimensions and change the direction of sound emission in the extended state as shown in FIG.
A is fixed to the buckle plate 6 at the bottom of the recessed space 7. Reference numeral 10 in FIG. 4 is a bass speaker unit called a woofer.

Figure 5 and the following are related to another embodiment,
Fig. 5 shows an application example in which the horn 4 is attached to the front of the speaker unit 1 placed on both sides of the cassette part 9 of a radio cassette recorder 8, and Fig. 6 shows a squawker in a 3-way 3-speaker speaker system. This is an example of an application in which the horn 4 is attached to the front of a midrange speaker unit 1 called a tweeter and a treble speaker unit 1 called a tweeter, respectively. This is applied to a parabolic type, a compound type, etc., and in each of these embodiments, a telescopic/bending operation knob 11, which also serves as a shape-retaining member, is fitted and supported in the opening 2B of the bellows body 2.

Further, the cylindrical membrane 3 may be a fiber braided body in the form of a net of extremely small meshes, and the front shape of the horn may be round, square, oval, or the like.

[Effect of idea]

As is already clear from the above detailed description, the present invention allows the directivity of the speaker to be adjusted over a wide range by freely adjusting the directionality of sound waves, the distance of sound waves, etc. by expanding, contracting and bending the bellows body 2. In addition, no matter how the bellows body 2 is expanded/contracted and bent, the elastic expansion/contraction of the cylindrical membrane 3 ensures that the inner surface of the horn is always a smooth continuous surface. Therefore, there is no or very little reflection of sound waves caused by the use of the bellows body 2, and in addition, the basic shape of the bellows body 2 can be changed to an exponential or hyperbolic shape that has an excellent horn effect. No matter what shape it is set to, the inner surface of the cylindrical membrane 3 can be made into a smooth continuous surface as described above, so the peak and dip ratios are small overall, and the sound pressure frequency characteristics, especially in the low range, are disturbed. It has the advantage of having a small amount of noise, high efficiency, and being able to reliably and fully achieve the desired horn effect.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
Figures 1 and 2 are vertical side views of the main parts, Figure 3 is an enlarged vertical side view of the main parts with some parts removed, Figure 4 is a perspective view of the overall appearance, and Figures 5 and 6 are respectively An overall external perspective view showing another embodiment (application example), Fig. 7A-
D is a schematic longitudinal sectional side view of the main part showing another embodiment. 1 is a speaker unit, 2 is a bellows body, 3 is a cylindrical membrane, 4 is a horn, 2A is a throat portion, and 2B is an opening portion.

Claims (1)

[Scope of utility model registration request] This speaker horn is constructed by attaching a bellows body 2 to the front surface of a speaker unit 1, which is coaxial or almost coaxial with the speaker unit 1 and can be expanded and contracted along the direction of the sound emission axis, and can be bent and fixed to the sound emission axis. A cylindrical membrane 3 that can be elastically expanded and contracted in the maximum expansion and contraction range of the bellows body 2 is placed inside the bellows body 2, with only both ends of the membrane 3 in the direction of the cylinder axis extending from the throat portion 2A of the bellows body 2.
and a speaker horn, characterized in that it is fitted into the opening 2B in a fixed position.