JPH11262080A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker used for various acoustic devices in which disturbances in a frequency characteristic due to distributed resonance is reduced and a high frequency reception frequency band is enhanced with superior sound quality. SOLUTION: A curved face from the joint of a voice coil up to an edge adhered part of an outer circumference of a diaphragm 7a is formed by part of an ellipse. The shape of the curve is realized such that no deflection point is provided, an apex angle AA of a joint with the voice coil is decreased and a contact angle BB of the edge adhered part at an outer circumferential part is increased. A low frequency response performance is improved, disturbance (peaks, dips) amount of the frequency characteristic from a middle frequency band to an intermediate/high frequency band is reduced and a high frequency reception band is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various kinds of audio equipment.

[0002]

2. Description of the Related Art A conventional speaker will be described with reference to a half sectional view of FIG.

According to FIG. 1, reference numeral 1 denotes a lower plate with a pole piece, and a magnet 3
A magnetic gap 4 having a uniform gap is provided between the pole piece of the lower plate 1 with the pole piece and the upper plate 2.

A frame 5 is joined to the upper plate 2,
A damper 6 and a diaphragm 7 are joined to the frame 5, and these parts are joined to the voice coil 8 to support the wire 9 of the voice coil 8 so as not to touch the magnetic gap 4.

A dust cap 10 for preventing dust from entering the magnetic gap 4 is provided near the center of the diaphragm 7.

Next, the operation of this speaker is as follows. When an electric signal is input to the wire 9 of the voice coil 8, the voice coil 8 moves by receiving a force from the magnetic gap 4, and this force is applied to the voice coil 8. The joined diaphragm 7 is moved, and the diaphragm 7 generates sound on the front of the speaker.

Here, as shown in FIG. 4, the diaphragm 7 has a single radius (R) or a plurality (composite) of composite radii from the joint with the voice coil 8 to the outer edge bonding portion. (R).

[0008]

However, in order to improve the elongation in the high frequency range for widening the frequency characteristics of the loudspeaker, it is necessary to reduce the apex angle A at the center of the diaphragm 7 as shown in FIG. Desirably, in order to improve the responsiveness in the low frequency range and mitigate the disturbance of the frequency characteristics in the middle frequency range, the diaphragm 7 needs to have a high degree of rigidity in terms of shape and moderate flexibility. It is desirable to increase the contact angle B between the outer peripheral portion of the diaphragm 7 and the edge of the edge bonding portion.

However, when the curved surface is formed as a single R as shown in FIG. 4, the apex angle A of the joint with the voice coil 8 is reduced, and the contact angle B with the outer edge bonding portion is reduced. It is not possible to make the shape compatible with making it larger,
It is not suitable for speaker diaphragms that perform wide-range reproduction. Therefore, by forming the curved surface shape into a composite R shape shown in FIG. 5, a shape is realized in which the apex angle Aa of the joint portion with the voice coil 8 is reduced and the contact angle Bb with the outer edge bonding portion is increased. Can be
The contact point between Rb and Rb becomes an inflection point, and the strength of the diaphragm 7 becomes weak, and resonance easily occurs as shown in the frequency characteristic diagram of FIG. Has a problem that it is likely to occur.

The present invention solves the above-mentioned problems, and realizes a shape in which the apex angle of the joint portion with the voice coil is reduced and the contact angle of the edge bonding portion on the outer periphery of the diaphragm is increased. An object of the present invention is to provide a speaker with excellent sound quality, which has improved low-frequency response, reduced disturbance (peak dip) in frequency characteristics in the middle to middle and high ranges, and improved a high-frequency reproduction frequency band.

[0011]

In order to solve the above-mentioned problems, a speaker according to the present invention has a curved surface shape having at least a plurality of radii from a joint portion with a voice coil to an outer edge bonding portion. It uses a diaphragm formed so that the intersection of the radii does not become an inflection point, and joins with a voice coil as having no inflection point while having a curved surface shape with multiple radii. Realizes a shape that reduces the apex angle of the part and increases the contact angle of the outer edge bonding part, improves the response in the low frequency range, and disturbs the frequency characteristics (peak dip) in the mid-range to mid-high range. It is possible to provide a loudspeaker having excellent sound quality in which the frequency is reduced and the high-frequency reproduction frequency band is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, at least a curved surface shape from a joint portion with a voice coil to an outer edge bonding portion has a plurality of radii, and an intersection of the radii. Using a diaphragm formed so that the part does not become an inflection point, and joining the voice coil with the curved surface of the diaphragm as a curved surface shape having multiple radii but having no inflection point Provides a speaker with excellent sound quality that reduces the apex angle of the part and increases the contact angle of the outer edge bonding part, thereby reducing distortion due to resonance dispersion and improving the high frequency reproduction frequency band. Is what you do.

According to a second aspect of the present invention, the curved surface of the diaphragm of the loudspeaker according to the first aspect is formed by a part of an ellipse, the distortion due to resonance dispersion is reduced, and the high frequency reproduction frequency is reduced. It is possible to easily provide a diaphragm suitable for improving the band and to realize an excellent speaker.

An embodiment of the speaker according to the present invention will be described below with reference to FIGS. 1 (a), 1 (b) and 2. Note that the configuration of the speaker itself is the same as that of the related art, and thus the description will be omitted.

FIG. 1A is a half sectional view of a diaphragm which is a main part of an embodiment of a speaker according to the present invention.
FIG. 1B is a half sectional view for explaining the relationship between the diaphragm, the edge and the voice coil.

According to FIG. 1, reference numeral 7a denotes a diaphragm, and 11 denotes an edge connected to the outer periphery of the diaphragm 7a via an edge bonding portion. The diaphragm 7a has a curved surface formed by a part of a regular elliptical shape having a major axis and a minor axis, and has a smooth shape having no inflection (flexion) curve point.

Next, the comparison results between the more specific speaker of the first embodiment and a comparative example are shown in (Table 1).

Comparative Example A is for a speaker using the diaphragm having the diaphragm shape shown in FIG. 4, and Comparative Example B is for a speaker using the diaphragm having the diaphragm shape shown in FIG. .

[0019]

[Table 1]

As is clear from Table 1, the loudspeaker according to the present embodiment has less frequency characteristic disturbance centered on the middle and high frequencies than the comparative examples A and B, and the high frequency reproduction frequency band is improved. confirmed.

FIG. 2 is a frequency sound pressure characteristic diagram of the present embodiment. Further, in the first embodiment, the curved shape of the diaphragm is formed as a regular ellipse, but the vertex angle AA at the joint with the voice coil is reduced and the contact angle BB at the outer edge bonding portion is increased. If it has an inflection point, it may be appropriately selected from those belonging to an ellipse.

[0022]

As described above, the loudspeaker of the present invention employs a diaphragm having a curved surface shape that is a part of an ellipse from the joint with the voice coil to the outer edge bonding portion. Reduces the apex angle of the joint with the voice coil without having a bend, and realizes a shape that increases the contact angle of the outer edge bonding part, reducing disturbance of frequency characteristics due to resonance dispersion. Another object of the present invention is to provide a loudspeaker having an excellent sound quality with an improved high-frequency reproduction frequency band.

[Brief description of the drawings]

FIG. 1A is a half sectional view of a diaphragm which is a main part of an embodiment of the speaker of the present invention. FIG.

FIG. 2 is the same sound pressure-frequency characteristic diagram

FIG. 3 is a half sectional view of a conventional speaker.

FIG. 4 is a side sectional view of a diaphragm portion which is a main part of the same.

FIG. 5 is a side sectional view of a diaphragm portion which is a main part of another conventional speaker.

FIG. 6 is a diagram showing a frequency sound pressure characteristic of a conventional speaker.

[Explanation of symbols]

7a diaphragm 8 voice coil AA vertex angle at center of diaphragm (vertical angle at joint with voice coil) BB outer peripheral contact angle of diaphragm (contact angle at edge bonded portion)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Nobuo Nakamura, Inventor No. 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A diaphragm having at least a plurality of radii in a curved surface from a joint with a voice coil to an outer edge bonding portion, and formed so that an intersection of the radii does not become an inflection point. Speaker using. 2. The loudspeaker according to claim 1, wherein a diaphragm whose curved surface is a part of an ellipse is used.