JP2773329B2 - headphone - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headphone having a rear housing having a rear sound term, and in particular, having a variable sound quality characteristic.

2. Description of the Related Art In recent years, headphones are roughly divided into open air type and closed type, but tend to have different sound qualities, and have been used properly according to applications and preferences. These are simply the differences between whether the housing at the rear of the speaker unit, which is the sound source, is closed or close to it, or is open. FIG. 7 is a cross-sectional view of a conventional example in which a rear housing is open, and has a front housing 32 and a rear housing 33 for holding a speaker unit 31. The sound is emitted from the sound hole 35 and is also emitted from the internal space 37 of the rear housing 33 via the braking cloth 36 via the rear sound hole 38. Here, headphones having different sound pressure frequency characteristics as headphones are obtained depending on the presence or absence of the rear sound hole.

By the way, in the above-described configuration, there is a problem that it is necessary to have two types of headphones, an open air type and a closed type, as necessary, and as one means for solving this, For example, a method as disclosed in Japanese Utility Model Publication No. 63-38627 has been conventionally used.

Problems to be Solved by the Invention However, in the above-mentioned conventional headphones, the ring member is rotated, and the operation is required with a very mechanical operation feeling, for example, apart from the light feeling of operating an electronic switch. Had the problem that

The present invention has been made in view of the above problems, and has as its object to provide a headphone that can be switched between an open air type and a closed type as if operating an electronic switch.

Means for Solving the Problems In order to achieve the above object, a headphone of the present invention has a cover for opening and closing a rear sound hole formed in a rear housing located behind a speaker unit, and switching between opening and closing of the cover. With respect to (1), a magnet for holding the open or closed state of the sound hole is provided, and the rear sound hole is opened and closed by operating the lid against the attractive force of the magnet.

According to the present invention, the open-air type and the closed type can be switched by operating the electronic switch only by operating the opening and closing of the lid.

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

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of a principal part thereof, and FIG. 3 is an exploded perspective view of a principal part.

In the drawings, 1 is a speaker unit, 2 is its diaphragm, and 3 is a braking cloth. Reference numeral 4 denotes a front housing, 5 denotes a front sound hole provided in the front housing 4, 6 denotes a rear housing, and 7 denotes a rear sound hole provided in the rear housing 6. The speaker unit includes the housing 4 and the rear housing 6.
And is held between.

With the above configuration, the diaphragm 2 of the speaker unit 1 is driven by the input signal, and the sound is emitted to the outside through the front sound hole 5 of the front housing 4 and at the same time, the rear part of the diaphragm 2 Is emitted to the internal space 6a of the rear housing 6 via the braking cloth 3. Here, depending on the presence or absence of the rear sound hole 7, the acoustic impedance of the rear part of the speaker unit 1 changes, and the sound pressure frequency characteristic as a headphone, particularly, its low frequency characteristic changes.

A cover means for opening and closing the rear sound hole 7 is formed in a recess 6 b provided in the rear housing 6. That is,
Reference numeral 8 denotes an opening / closing lever which constitutes a lid. The opening / closing lever 8 rotatably supports a rotating shaft 9 on a bearing 10 provided on the rear housing 6, and the opening / closing lever 8 is provided with push buttons 11a and 11b. . 12a, 12b and 13a, 13b are ring-shaped magnets, and the magnetized states of the opposing surfaces are magnetized so as to be attracted to each other, and one of the magnets 12a, 13a is provided in the rear housing 6. The other magnets 12b and 13b are provided on the opening / closing lever 8, and are mounted so that the rear sound receiving hole 7 is located substantially at the center of the magnet 13a. 14 is a decorative panel of the rear housing recess 6b,
The decorative panel 14 has a sound emitting hole 15 and a hole 15a through which the push buttons 11a and 11b are exposed to the outside. In FIG. 1, A is a head hanger for supporting the rear housing 6 and holding it at the top.

Next, the operation of the first embodiment described above will be described.

In the illustrated state, the magnets 13a and 13b are attracted and the rear sound hole 7 is closed. Then, when one of the push buttons 11a is pressed, a clockwise turning force is generated in the opening / closing lever 8 around the rotating shaft 9, the magnets 13a and 13b are separated, and the magnets 12a and 12b are attracted. Stabilize. In this state, the rear sound hole 7 is opened, and the sound pressure in the inner space 6a of the rear housing 6 leaks through the rear sound hole 7 to the outside through the sound emission hole 15 formed in the decorative panel 14. The acoustic impedance at the rear of the speaker unit changes, and the sound pressure frequency characteristics change. To return to the original state, when the other push button 11b is pressed, the state returns to the illustrated state, and the rear sound hole 7 is closed.

In the above embodiment, the magnets 12a, 12b and 13a, 13b may be made of a material in which a magnetic material is diffused in rubber or plastic, for example. Since such materials have soft surfaces, they adhere to each other when adsorbed, and the blocking effect becomes higher.

FIG. 4 shows a second embodiment of the present invention. The difference from the above embodiment is that the magnets 12b and 13b are eliminated and the opening / closing lever 8 is made of a ferromagnetic material such as soft iron. Are identical.

FIG. 5 shows a third embodiment of the present invention, which is different from the above-mentioned two embodiments in that an opening / closing lever 8 made of a ferromagnetic material is replaced with a ring-shaped felt or plastic packing instead of a ring-shaped magnet. Materials 16a and 16b are provided, and magnets 17a and 17b are attached to the rear housing 6 near the members 16a and 16b. Here, if the surfaces of the magnets 17a and 17b are slightly lower than the surfaces of the packing members 16a and 16b, the shock of switching is absorbed and no collision noise is generated. It should be noted that the present invention is not limited to this example, and such a cushioning material may be appropriately attached as necessary to hit the opening / closing lever 8 or the like.

Further, in this third embodiment, a ring-shaped packing material is attached to the rear housing 6 side, but a square or circular packing material may be attached to the opening / closing lever side instead of a ring shape.

FIG. 6 shows still another example of the present invention, in which a rotating shaft 19 is provided at the tip of a lever 18 instead of a seesaw-shaped opening / closing lever as in the previous examples, and a bearing 20 provided on the rear housing 6 is provided. , And the knob 21 is operated to open and close the ring-shaped magnets 12, 13 with the same function as in the above embodiment.

Effect of the Invention As described above, according to the present invention, by switching the sound hole at the rear of the housing to open or closed, the sound quality characteristic can be changed to an open air type or a closed type, so that two headphones can be used with one headphone. Characteristics are obtained, and the switching is performed by using the attractive force of the magnet to maintain the open or closed state of the sound hole, so that the switching can be performed with a small pressing force as if the electronic switch were operated.

Further, by using a ring-shaped rubber or a plastic magnet for the holding magnet as required, the effect of increasing the degree of sealing of the ventilation holes and reducing the shock of switching can be expected.

Thus, the present invention is useful for enhancing the commercial value of headphones.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view of the essential part, FIG. 3 is a partially exploded perspective view of the same, and FIGS.
FIG. 6 and FIG. 6 are cross-sectional views of essential parts showing another embodiment of the present invention, and FIG. 1 ... speaker unit, 6 ... rear housing, 7 ...
... Rear sound hole, 8... Opening / closing lever constituting lid, 12a, 12
b, 13a, 13b, 17a, 17b ... magnet, 16a, 16b ... packing material.

Claims (4)

(57) [Claims] 1. A magnet, which has a cover for opening and closing a rear sound hole formed in a rear housing located behind a speaker unit, and which keeps the sound hole open or closed with respect to switching between opening and closing of the cover. A headphone, wherein the rear sound hole is opened and closed by operating the lid against the attraction of the magnet. 2. The headphone according to claim 1, wherein a ring-shaped magnet is arranged around the rear sound hole. 3. The headphone according to claim 1, wherein a ring-shaped rubber or a plastic magnet is arranged around the rear sound hole. 4. The headphone according to claim 1, wherein a magnet is arranged near a packing material that opens and closes by abutting on or surrounding the rear sound hole in a ring shape.