JP2521823Y2 - Speaker - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way loudspeaker capable of individually reproducing a bass signal and a signal in another sound range.

[0002]

2. Description of the Related Art Conventionally, as a speaker of this type, two gaps are formed concentrically on a magnetic circuit, a voice coil for a tweeter or a squawker is arranged on an inner gap, and a woofer voice is arranged on an outer gap. Coaxial speakers in which coils are arranged are widely known. However, this device requires two magnetic circuits even though it shares a part of the yoke, so that the number of parts is large and assembly is complicated, resulting in an expensive speaker. There was.

On the other hand, the loudspeaker disclosed in Japanese Utility Model Laid-Open Publication No. 62-27000 has a single magnetic circuit, a center pole 2 erected on a lower plate 1 and an upper plate, as shown in FIG. Since two types of voice coils 5 and 6 are arranged in the gap 4 between the two,
If the inner voice coil 5 is used for a tweeter or squawker and the outer voice coil 6 is used for a woofer, it is possible to manufacture a speaker capable of individually reproducing signals in the low frequency range and other sound ranges at low cost. Reference numeral 7 in the figure denotes a ring-shaped magnet provided between the lower plate 1 and the upper plate 3.

[0004]

However, since the voice coil for the woofer, which requires a large driving force, must be disposed in a gap having a high magnetic flux density, the voice coil 6 having the structure shown in FIG. For woofer,
The gap 4 becomes too wide and the magnetic flux density becomes insufficient, so that there is a disadvantage that the sensitivity in the low frequency range is deteriorated.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a two-way loudspeaker having good sensitivity in a low frequency range at low cost.

[0006]

The object of the present invention is to provide a first voice coil for a woofer and a second voice coil for a tweeter or squawker in a gap formed around a center pole of a magnetic circuit. In the loudspeaker in which the second voice coil is disposed, a step extending along the circumferential direction is provided on the outer periphery of the tip of the center pole to partially widen the gap, and the second gap is provided around the step. This is achieved by placing a voice coil.

[0007]

According to the above means, the second voice coil, which does not require a particularly high magnetic flux density, is arranged in a relatively wide area in the gap, so that the first voice coil for the woofer is arranged in a narrow area in the gap. It can be arranged and driven under high magnetic flux density.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the sectional view of FIG. 1 and an enlarged view of a main part of FIG.

In these figures, reference numeral 1 denotes a lower plate on which a center pole 2 is erected, 3 denotes an upper plate,
Is a gap formed around the center pole 2,
5 is a tweeter voice coil, 6 is a woofer voice coil, 7 is a ring-shaped magnet provided between the lower and upper plates 1 and 3, 8 is a woofer damper, 9 is a frame, and 10 is a tweeter voice. A tweeter cone vibrated by the coil 5 and a woofer cone 11 vibrated by the woofer voice coil 6 are shown. And
As is apparent from FIG. 2, a step 2a extending in the circumferential direction is formed on the outer periphery of the tip of the center pole 2, and a tweeter damper 12 made of silicon rubber or the like is provided around the step 2a. Via the voice coil 5 for the tweeter
Is arranged.

That is, in this speaker, the voice coil 5 for the tweeter and the voice coil 6 for the woofer are arranged in the gap 4 of one magnetic circuit to separately reproduce the high frequency signal and the low frequency signal. However, since the gap 4 is partially widened around the stepped portion 2a of the center pole 2 and the tweeter voice coil 5, which does not require a particularly high magnetic flux density, is disposed there, a large driving force is required. The woofer voice coil 6 can be arranged in a region where the gap 4 is narrow and leakage of magnetic flux is small.

As described above, the embodiment requires only one magnetic circuit in spite of being a two-way loudspeaker, so that the number of parts and the number of assembling steps can be reduced, and a large cost reduction is realized. Moreover, the step 2 of the center pole 2
Since the space for disposing the tweeter voice coil 5 is secured by utilizing the a, the woofer voice coil 6 is disposed in a narrow area in the gap 4, and therefore the woofer voice coil 6 is placed under a high magnetic flux density. Can be driven
It is possible to reproduce a bass signal with good sensitivity.

In the above embodiment, the case where the voice coil 5 disposed inside the gap 4 is for a tweeter is described. However, the voice coil 5 may be for a squawker.

[0013]

[Effects of the Invention] As described above, the present invention partially widens the gap of the magnetic circuit and arranges a voice coil for tweeter or squawker there.
The voice coil for the woofer is arranged under a high magnetic flux density with a narrow gap so that the necessary driving force can be obtained, so we offer a 2-way speaker with good sensitivity in the low frequency range at low cost. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an entire configuration of a speaker according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the speaker shown in FIG.

FIG. 3 is a cross-sectional view showing a magnetic circuit of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower plate 2 Center pole 2a Step part 3 Upper plate 4 Gear gap 5 Voice coil for tweeter 6 Voice coil for woofer 7 Magnet

Claims (1)

(57) [Scope of request for utility model registration] A loudspeaker in which a first voice coil for a woofer and a second voice coil for a tweeter or a squawker are provided in a gap formed around a center pole of a magnetic circuit. A speaker, wherein a step extending in the circumferential direction is provided on the outer periphery of the tip of the center pole to partially widen the gap, and the second voice coil is arranged around the step. .