JP2003037894A - Speaker and speaker device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker and a speaker device using the speaker capable of reducing any influence due to the edge oscillation of the speaker, and smoothly executing noise control. SOLUTION: An edge 13a of a speaker 1 is provided with a small width part 13a, and a microphone 2a is set in the neighborhood so that a feedback circuit to a control unit can be constituted. The speaker output obtained by reducing the influence of edge oscillation by the small width part 13a is returned to the control unit so that noise control can be smoothly executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used as an active noise canceller and a speaker device using this speaker.

[0002]

2. Description of the Related Art Active noise cancellers are used indoors and in vehicles as a means for reducing noise. Research is also underway to reduce noise when the vehicle is running. A speaker device used in such a conventional noise canceller and a speaker used in the speaker device will be described with reference to FIGS. 4 and 5.

FIG. 4 is a conceptual view of a conventional speaker device, and FIG. 5 is a side sectional view of a speaker used in the device.

In FIG. 1, reference numeral 1 denotes a speaker, and a microphone 2 and a microphone 3 are mounted near the speaker 1.

Reference numeral 4 denotes a control unit having a built-in amplifier, which feeds back the output of a microphone input 5 which takes in the sound of the speaker 1 with the microphone 2 and compares the external sound with the microphone input 6 which takes in with the microphone 3 and determines a predetermined value. The sound to be silenced is extracted and the sound of the frequency of the opposite phase is output to the speaker 1 via the amplifier.

Next, the operation of the speaker device will be described. The electric signal of the microphone input 6 taken in by the microphone 3 is extracted by the control unit 4 as a noise signal to be canceled (all the microphone input 6 from the microphone 3 is noisy. In this case, signals of all frequencies are targeted. Also, it is performed by known signal processing such as selecting frequencies of human voice and extracting other frequencies.) Electrical signal and 180
° Noise canceling signals 7 having different phases are generated, amplified by an amplifier, input to the speaker 1 and sounded by the speaker 1 to cancel the noise.
The synthesized sound of the sound of the speaker 1 and the noise input to the control unit 4 is fed back to the control unit 4, the microphone input 6 from the microphone 3 is compared with the microphone input 5 which is the synthesized sound, and the noise canceling signal 7 is appropriately amplified. And optimally suppress noise.

It should be noted that although the description has been made in this prior art assuming that there are two microphones 2 and 3, the number of microphones 2 and 3 may be one, or three or more, depending on the configuration of the control unit 4. It is appropriately selected depending on the intended use.

The speaker used in the speaker device having the above-mentioned structure varies depending on the intended use, but as a general example, a magnetic circuit 10 having a magnetic gap 11 as shown in FIG. A frame 12 coupled to the frame 12, an outer periphery coupled to the frame 12 through an edge 13, an inner periphery coupled to a voice coil 14 fitted in the magnetic gap 11, and a diaphragm 15 coupled to the inner periphery for the voice coil. And a damper 16 which is connected to the frame 12 at its outer periphery and supports the voice coil 14 so as to be vertically movable.

[0009]

However, the edge resonance is structurally present in the speaker 1, and the sound pressure frequency characteristic is disturbed by the edge resonance in the vicinity of 1 KHz, and the speaker is disturbed by the edge resonance, which is the output of the speaker 1 itself. There is a problem that noise control of the device cannot be performed smoothly.

For this reason, various methods such as applying a dumping agent to the edge 13 and changing the shape of the edge 13 have been studied, but the cost is increased and the reliability and acoustic characteristics are deteriorated. We have not yet reached the point of solving practical problems.

[0011]

In order to solve the above-mentioned problems, a speaker according to a first aspect of the present invention is provided with a narrow width portion at an edge, and a damper portion facing the narrow width portion. The large amplitude part is provided to suppress the disturbance of the sound pressure frequency characteristic due to the edge resonance in the narrow part of the edge to stabilize the input to the microphone and to ensure the stable driving of the speaker device. By providing the large amplitude part in the opposing damper part, the rolling of the diaphragm is prevented and the gap defect due to the contact of the voice coil in the magnetic gap is prevented.

According to a second aspect of the speaker of the present invention, the large amplitude part of the damper according to the first aspect is realized by making the height difference of corrugation larger than other parts, and is extremely effective as a damper. It can be easily produced and contributes to cost reduction.

According to a third aspect of the speaker of the present invention, the small width portion of the edge according to the first aspect is provided such that the width of the edge is narrower than other portions, and the edge shape and the diaphragm are provided. The structure can be extremely easily formed only by using the member whose shape is changed, and the cost can be reduced.

According to a fourth aspect of the speaker device of the present invention, a microphone is arranged in the vicinity of the small width portion of the edge of the speaker according to the first, second or third aspect. By arranging the speaker device at a position where it is unlikely to be affected by the edge resonance, it is possible to drive the speaker device for a noise canceller extremely stably.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a speaker of the present invention and a speaker device using the same will be described with reference to FIGS. It should be noted that the same parts as those of the prior art are denoted by the same reference numerals to simplify the description.

(Embodiment 1) FIG. 1 is a sectional view of a speaker which is a main part of a speaker device of the present invention, FIG. 2 is a top view thereof, and FIG. 3 is a sound pressure frequency characteristic diagram.

Only the difference from the prior art will be described with reference to the figure. Reference numeral 13a is the edge of the speaker, and the edge width a shown in FIG.
3b and the large width portion 13c are provided, and the space between them is continuously changed circumferentially.

The edge 13a has a diaphragm 15 on the inner peripheral side.
Since a part of them overlaps and is adhesively bonded, when the width of the edge 13a is continuously changed to form the small width portion 13b and the large width portion 13c, the outer peripheral shape of the diaphragm 15 is Are formed in conformity with the shape of the edge 13a described above, and are adhesively bonded.

Reference numeral 16a is a damper, and the upper and lower amplitude amounts by the corrugation 16b are set in association with the edge width a on a diagonal line with the center of the speaker as a reference.

That is, the damper 16 facing the narrow portion 13b
The portion a has the largest amount of amplitude, and the portion of the damper 16a facing the wide portion 13c has the smallest amount of amplitude.

Specifically, the amount of amplitude of the damper 16a is generally determined by the height difference between the peaks and valleys of the corrugation 16b, which can be formed extremely easily by the molding die used when the damper 16a is formed, and the edge The portion of the damper 16a facing the narrow portion 13b of 13a increases the height difference of the peaks and valleys of the corrugation 16b to facilitate vibration, and conversely, the portion of the damper 16a facing the wide portion 13c reduces the height difference of the peaks of the corrugation 16b. It is made small to make it difficult to vibrate.

As described above, even if the width a of the edge 13a is continuously changed, the amplitude amount of each portion of the damper 16a is adjusted to the peak and valley of the corrugation 16b in consideration of the amplitude amount of the edge 13a in each of these portions. Since the shape is changed and the height difference is changed, the voice coil 14 normally moves up and down during driving despite the speaker having the different width of the edge 13a, and the voice coil 14 abuts on the magnetic circuit 10 in the magnetic gap 11. A magnetic gap defect is unlikely to occur.

Reference numeral 2a denotes a microphone for inputting the sound of the speaker 1, which corresponds to the microphone 2 of the prior art. The position of the microphone 2a is provided near the narrow portion 13b of the edge portion 13a. It is a thing.

The width of the narrow portion 13b has the smallest edge amplitude and the least influence of edge resonance.

3b shows the sound pressure frequency characteristic of the speaker near the narrow portion 13b, and c shows the sound pressure frequency characteristic of the conventional speaker. As is clear from the figure (displayed at different heights for comparison), in the characteristic c, the peak dip is large from 500 Hz to 2 KHz (inside the circle), but this is due to edge resonance. However, in the characteristic b, the same peak dip from 500 Hz to 2 KHz (in a circle) is much smaller than that of the conventional characteristic c, and it is confirmed that the influence of the edge resonance is suppressed very effectively. It was

That is, since the microphone 2a can feed back the microphone input 5 to the control unit 4 without being affected by the edge resonance of the speaker itself, the speaker device of the present embodiment performs extremely stable noise control as an active noise canceller. You can do things.

[0027]

INDUSTRIAL APPLICABILITY As described above, the speaker of the present invention and the speaker device using the same can provide smooth noise control, high reliability, and excellent acoustic characteristics equivalent to those of the conventional speaker. is there.

[Brief description of drawings]

FIG. 1 is a side sectional view of a speaker and a microphone, which are essential parts of a speaker device of the present invention.

FIG. 2 is a top view of the same.

[Figure 3] Same sound pressure frequency characteristic diagram

FIG. 4 is a block diagram of a conventional speaker device.

FIG. 5 is a side sectional view of the speaker, which is the main part of the same.

[Explanation of symbols] 1 speaker 2,2a, 3 microphones 4 control unit 10 Magnetic circuit 11 magnetic gap 12 frames 13a edge 13b narrow part 14 voice coils 15 diaphragm 16a damper

Claims (4)

[Claims] 1. A magnetic circuit, a frame adhesively bonded to the magnetic circuit, a diaphragm having an outer periphery coupled to the frame through an edge, and a magnetic circuit coupled to an inner periphery of the diaphragm. A speaker comprising a voice coil fitted in a magnetic gap, a damper having an outer periphery coupled to a frame and an inner periphery coupled to the voice coil, wherein a narrow portion is provided at the edge, A speaker in which a large amplitude portion is provided in the damper portion facing the small width portion. 2. The speaker according to claim 1, wherein a large amplitude portion of the damper is formed by making a difference in height of corrugation larger than that of other portions. 3. The speaker according to claim 1, wherein the small width portion of the edge is provided such that the width of the edge is narrower than that of the other portion. 4. Claim 1 or claim 2 or claim 3.
A speaker described in the above, a microphone arranged near a narrow portion of an edge of the speaker, at least a sound generated by the speaker input to the microphone and an ambient sound input from the microphone and / or another microphone. A speaker device comprising a control unit provided with a feedback circuit for outputting a sound output for canceling sound to the speaker.