JPS63156498A - Headphone - Google Patents

Abstract

PURPOSE:To improve the sense of mounting by providing an elastic foamed polymer sandwiching integrally a shape memory alloy on the outer periphery of a speaker and the front peripheral part of a diaphragm so as to improve the contact between an ear and a headphone, thereby reproducing a signal from a low frequency. CONSTITUTION:The shape memory alloy 2 sandwiched integrally by the elastic foamed polymer (polymers 1, 3) is provided to the periphery of the speaker and the outer periphery of a protector 12. The polymer 3 has a smaller circumference than that of the polymer 1 and the shape memory alloy 2 is sandwiched to a gap between the polymers 1 and 3. The polymer 3 is fixed to a case 10. The polymers 1, 3 are restored to the original shape in nearly 45sec even if they are pressed and deformed momentarily. The size of the polymer 3 is decreased by using the shape memory alloy 2 and mounted to the ear. Then the size of the shape memory alloy 2 is expanded by the body temperature, the polymer 3 is also expanded as time lapses, resulting that the polymer 1 is fitted closely to the ear. Thus, the leakage of sound is less and the signal is reproduced up to low frequencies.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to headphones with excellent low frequency reproduction and wearability.

Conventional technology In recent years, headphones have become cassette tape recorders.

With the miniaturization of compact disc players, they are now widely used (for example, Takeo Yamamoto, "Speaker System (Part 2)", J1 Radio Gijutsu Co., Ltd., p., p.

479-1), p. 604).

Hereinafter, an example of the above-mentioned conventional headphones will be described with reference to the drawings.

FIG. 3 is a sectional view showing the structure of a conventional headphone. In FIG. 3, 4 is a yoke, 5 is a magnet, and 6 is a plate, and these three components constitute a magnetic circuit. Reference numeral 7 denotes a diaphragm which is integrated with the voice coil 8 and is installed in the magnetic gap in the magnetic circuit. This yoke 4. Magnet S.

Plate 6 and diaphragm 7. The voice coil 8 forms a speaker. 9 is a code for transmitting electrical signals. 11 is a rubber ring for attachment. A protector 12 protects the diaphragm 7.

The operation of the bed phone configured as described above will be explained below.

First, the signal transmitted from the cord 9 is guided to the voice coil 8. The voice coil 8 is installed in a magnetic gap of a magnetic circuit consisting of a yoke 4, a magnet 6, and a plate 6. Therefore, the electric signal flowing through the voice coil 8 crosses the magnetic field, and force is transmitted to the diaphragm 7, thereby emitting sound.

The magnetic circuit and the protector 12 are formed by a circular rubber ring 1.
1 to the case 1o.

The headphones configured as described above are worn on the ears to listen to sounds, music, and the like.

Problems to be Solved by the Invention However, with the above configuration, when the headphones are worn on the ears, sound leaks through the gap between the ears and the headphones, reducing the low frequency reproduction ability. Additionally, there is a problem in that the headphones are uncomfortable to wear due to individual differences in the size of the ears, so there is a desire to develop headphones that are particularly good at reproducing low frequencies.

In view of the above problems, the present invention provides headphones that are excellent in low frequency reproduction regardless of individual differences in ear size.

Means for Solving the Problems In order to achieve the above objects, the hesodophone of the present invention includes a case for fixing the circumferential direction of the diaphragm of a speaker, and a protector for covering the front surface of the diaphragm, and the diaphragm A structure in which elastic foamed polymer is provided around the periphery of the case corresponding to the circumferential direction of the protector and on the outer periphery other than the center of the protector, which takes a longer time to return to its original shape than the pressurized deformation time when the shape memory alloy is sandwiched and integrated. It has become.

Effect of the Invention With the above-described configuration, the present invention can reduce sound leakage during installation, and can reproduce low frequencies.

EXAMPLE Hereinafter, a headphone according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of headphones in one embodiment of the present invention. In FIG. 1, 1 and 3 are elastic foam polymers for mounting, and 2 is a shape memory alloy. 4 is York,
6 is a magnet, 6 is a plate, and these four parts form a magnetic circuit. 7 is a diaphragm which is integrated with the voice coil 8. 9 is a code that transmits electrical signals, 12
is a protector that protects the diaphragm 7. These parts are fixed with a case 10. York 4. Magnet 5.
Plate 6, diaphragm 7. Voice coil 8° code 9. Case 10. Each component of the protector 12 has the same configuration as the conventional example.

Regarding the headphones configured as above, the following is the first part.
The operation will be explained using the diagram and FIG.

Figure 1 is a sectional view showing the structure of the headphones, Figure 2a is a front view showing the concha length and width of the ear, and Figure 2 is the shape of the integrated elastic foam polymer sandwiching the shape memory alloy. FIG. First, the electric signal transmitted from cord 9 is transmitted to yoke 4. Magnet 5, plate 6, diaphragm 7. It is guided to a speaker consisting of a voice coil 8. The principle operation here is exactly the same as the conventional example. The difference from the conventional example is that the periphery of the speaker and the outer periphery of the protector 12 are made of elastic foam polymer (for example, disclosed in Japanese Patent Application Laid-Open No. 48-50588).
Hereinafter, simply polymer 1. The present invention is based on the provision of a shape memory alloy 2 sandwiched and integrated with polymers 3). Polymer 3 has a smaller circumference than polymer 1, and shape memory alloy 2 is sandwiched between polymers 1 and 3. Polymer 3 is fixed to case 1o.

Above polymer 1. Even if the polymer 3 is deformed by instantaneous pressure, it will return to its original shape in about 46 seconds. This polymer 3 is made into a small shape using a shape memory alloy 2 and worn on the ear. Then, as the shape memory alloy 2 becomes larger due to the temperature increase due to body temperature, the polymer 3 also becomes larger over time, and the polymer 1 ends up coming into close contact with the ear. Therefore, sound leakage is reduced and it is possible to reproduce even low frequencies.

Also, it is easy to install. Here, polymer 1 and polymer 3
The shape memory alloy 2 has a ring shape concentric with the speaker, and as shown in Figure 2a, the concha length and concha width W
If the shape is made into an ellipse as shown in FIG. 2, the leakage can be further reduced and low frequency reproduction becomes possible. Here, the ellipse ratio L/W is approximately 1.3 to 2.4.

Effects of the Invention As described above, the present invention improves the adhesion between the ear and the headphones by providing an elastic foam polymer with a shape memory alloy sandwiched and integrated around the outer periphery of the speaker and the front periphery of the diaphragm. , sound leakage is reduced. Therefore, it is possible to reproduce from the low range, and the fit can be improved because it fits perfectly to the ear without considering individual differences. Furthermore, since the adhesion has been improved, it is possible to reduce the sound leaking from the headphones to the outside, which also prevents noise from being heard by people other than the listener.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of headphones according to an embodiment of the present invention, and FIG. 2 a shows the length of the concha of the ear. FIG. 2 is a front view showing the width of the concha; FIG. 2 is a sectional view showing the shape of an elastic foam polymer sandwiching and integrating a shape memory alloy; and FIG. 3 is a sectional view showing the structure of a conventional headphone. 1...Elastic foam polymer, 2...Shape memory alloy, 3...Elastic foam polymer, 4...Yoke, 5...Magnet, 6... ...Plate, 7
...Diaphragm, 8...Voice coil, 10.
...Case, 12...Protector. Name of agent: Patent attorney Toshio Nakao and 1 other person! −
"Bound" raw foamed polymer 7-Otatsugaiku 5- Maguko Soto
12-Protegu B-Plate Fig. 1/3--\Ear tA/-One ear shell R width (a-) (b)

Claims (2)

[Claims] (1) A case that fixes the periphery of the diaphragm of a speaker, and a protector that covers the front surface of the diaphragm, except for the periphery of the case corresponding to the circumferential direction of the diaphragm and the center of the protector. 1. A headphone characterized in that an elastic foam polymer is provided on the outer periphery of the headphone, which takes a longer time to return to its original shape than it takes to deform under pressure when the shape memory alloy is sandwiched and integrated. (2) The headphone according to claim 1, wherein the elastic foam polymer sandwiched and integrated with the shape memory alloy has an elliptical shape that matches the length and width of the concha.