WO2020250791A1

WO2020250791A1 - Earphone

Info

Publication number: WO2020250791A1
Application number: PCT/JP2020/022057
Authority: WO
Inventors: 利夫小田
Original assignee: 利夫小田
Priority date: 2019-06-12
Filing date: 2020-06-04
Publication date: 2020-12-17
Also published as: JP7155469B2; JP2020202547A

Abstract

[Problem] To manufacture an earphone that outputs high-quality high-pitched, middle-pitched, and low-pitched sounds by changing a weak low register into a high-quality low register using one dynamic speaker (having a slightly strengthened high register, and using a vibrating membrane of a single material without adding another material such as plating). [Solution] As depicted in fig. 1, a speaker S is mounted in a front housing A, sound conduit inlets such as a first sound path port a (a speaker front surface, an intake for high-pitched sound frequencies) and a second sound path port b (a speaker back surface, an intake for low-pitched sound frequencies that have passed through a low-pitched sound refined component D) are manufactured separately for a high register and a low register, which meet in a sound conduit, and an earphone is closely attached to an external auditory canal by an ear tip P, and conducts sounds to an eardrum and a cochlea by both air conduction and bone conduction.

Description

earphone

The product of the present invention uses a speaker (a vibrating membrane made of a single material without adding other materials such as plating) with a slightly stronger treble range, and uses an electric amplifier for a weak bass range. It is a technology related to earphones that devised a method of amplifying without.

It is said that it is impossible for the vibrating membrane of a speaker to output sounds having different frequencies (high-quality treble and high-quality bass) with only a single material.

Therefore, the idea was to form the whole with a vibrating film that outputs a low frequency, and metal-plat the central part to output a high frequency and to output a low frequency from the periphery.

The treble of the metal-plated vibrating membrane (the treble of the piano is the sound that pierces the ear, the sound of the stringed instrument is not reproduced as the raw sound) The treble with a bad tone is output and you can not get drunk with music Is.

JP 2016-213787 JP 2015-039127 JP-A-2017-255415

Considering the claims and problems of JP-A-2016-213787,
In claim 1,
... Each communicates only by a relatively small tubular space.
In claim 2,
Tubular space ... The inside is filled with acoustic resistance material ...
Challenge Achieving a balanced frequency over a wide band while reducing sound leakage.
(Small tubular space) (Internally filled with acoustic resistor material) (Achieving balanced frequency characteristics over a wide band) From these sentences, the purpose of the patent application is to create sound over a wide band. I understand. It can be understood that these sentences are a balance of treble, midrange, and bass, and are not earphones that strongly produce bass.

Considering the claims and problems of Japanese Patent Application Laid-Open No. 2015-039127,
Claim 1,
An earphone having a first acoustic resistance member and ... a second acoustic resistance member.
Claim 2 refers to the ratio of the acoustic resistance members 1 and 2. (... the second is smaller than the first ...)
In claim 3, how to install the acoustic resistance member (... earphones that come into contact with each other without gaps).
The challenge is to reduce the size of earphones while expanding the bass range.
Claims 1, 2 and 3 claim that bass can be output by using an acoustic resistance member, but the mechanism for increasing the sound pressure (see 0023 of the present specification) is such that the incorporated sound is at the exit. The sound pressure does not rise unless the structure is squeezed finely. Therefore, high quality bass is not output.

Japanese Patent Application Laid-Open No. 2017-255415 is an application for which I applied for a patent and was registered as a patent on February 1, 2019.
Describe the reason for this patent application,
The speaker used in JP-A-2017-255415 is an earphone made by using a vibrating membrane (a vibrating membrane that can output high-pitched sound, middle-pitched sound, and low-pitched sound evenly), and the following three points must be improved before marketing. I thought it would be difficult to spread.
1 The treble range is output compared to other companies, but it is not an overwhelmingly superior treble.
For this reason, this time, we used a material with a slightly stronger treble range of the speaker's vibrating membrane.
2 As a result of the experiment, it was found that the bass range output from the above speaker is weak, and if it is a patented part (silicon tube method), eight are required to output high quality bass.
If the housing of the earphone is manufactured by this silicon tube method, people with small ears will not have enough room to attach it, and the spread will be restricted due to the feeling of oppression.
3 Silicone tube is an economically expensive earphone that requires the work of combining a thin tube and a tube that stores the damping material.
For the above reasons, it was decided to newly manufacture bass refined parts.

The means for solving the above problems are described below.
The invention according to claim 1 provides a space for accommodating a bass refining component for the first sound path opening for taking in the sound on the front side of the speaker and a sound on the back side of the speaker, and sounds the bass frequency extracted from the stored bass refining component. It features a structure provided with a second sound path opening that flows through a conduit.

The space formed in contact with the second sound path opening is formed on the front housing side, and serves to install bass purification parts and guide the extracted bass to the sound conduit.

The bass refined parts are molded from an elastomer resin with a shore hardness of 20 to 30, and there are 6 spaces for the damping material at the upper entrance, 2 holes in the center with an inner diameter of 1 mm, and 4 other holes. A thin tube having an inner diameter of 0.4 to 0.5 mm, an outer diameter of 1 mm, and a length of 2.8 mm is formed.

Silicone tubes with an inner diameter of 0.5 mm, an outer diameter of 1 mm, and a length of 6 mm are retrofitted to the two holes with an inner diameter of 1 mm in the center of the bass refined part.

Bass refined parts and six spaces at the top entrance are loaded with foamed polyurethane or foamed synthetic rubber damping material.

By covering the outer wall of the bass refined component with a soft tape, the bass frequency generated in the entire bass refined component can be guided to the sound conduit.

The plastic top lid has 6 holes and is made with specifications that match the hole positions with the 6 upper entrances of the bass refined parts, and is attached with double-sided tape or adhesive, and is attached to the space in this combined state. Enter, and the top lid is glued together with the space.

By using a speaker with a slightly stronger treble range, the original treble range of the voice / instrument can be reproduced.

By devising a part that strongly outputs the weak bass range for the first time unlike the sound creation of earphones that have been made so far, the sound range output from the sound conduit is close to the ideal and high quality treble, middle and bass are output. it can.

Since the material of the vibrating membrane of the balanced armature type earphone is metal, metal sounds such as brass instruments and cymbals are suitable, but unfortunately the sounds of string instruments, woodwind instruments, drums, etc. cannot be reproduced as raw sounds. ..

Dynamic speakers are also used in other high-end audio systems. That is, it is a speaker that can reproduce the original sound of a voice / musical instrument. Since the weak points of high and low frequencies cannot be reproduced on the same diaphragm, many earphone manufacturers use metal plating in the center of the diaphragm to reproduce the high frequencies. In the high range output by this method, the piano sound becomes a sound that touches the ear, and many earphones do not output beautiful high range due to the vibration of the low range. The product of the present invention uses a vibrating membrane made of a single material with a slightly stronger treble range, and outputs the bass range with bass refined parts. This method produces high-quality treble, midrange, and bass. It is an earphone that can output in a well-balanced manner.

It is sectional drawing of the product of this invention. It is a figure seen from the back side of a front housing. It is a top view of the upper lid. It is a top view of the bass refined part. It is sectional drawing of the bass refined part. It is the figure which combined the upper lid and the bass refined part. It is the figure which showed the detail at the time of installing a bass refined part.

Hereinafter, embodiments for carrying out the product of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional configuration diagram of the earphone of the present invention.

As shown in FIG. 1, the speaker S is installed in the front housing A. The sound emitted from the speaker S and the sound on the front side pass through the first sound path opening a and are transmitted to the sound conduit O.
The sound on the back side is the 6 holes of the upper lid E installed in the space c, the 6 spaces n of the bass refined part D bonded to the upper lid E, the 4 elastomer tubes m, and the 2 retrofit silicon tubes d. It passes through and is transmitted from the second sound path opening b to the sound conduit O.

The bass refined part D is a material called an elastomer, which is molded by an injection molding machine using a mold. The structure is shown in FIGS. 4, 5, 6, and 7.
This bass purification component D is a component that forms the basis of the product of the present invention, and is a device that changes sound waves (weak bass frequencies) emitted from the speaker S into strong bass.
Explain why you can change it to a strong bass.
1 Sound is transmitted faster by substances than by air. (The softer the bass, the better it propagates)
2 When a damping material f (polyurethane foam or synthetic foam rubber) is inserted into the space n of the bass refined component D and sound waves are passed through, the treble frequency and the middle frequency become difficult to propagate, and only the bass frequency propagates the damping material f. go. The sound pressure output behind the speaker S is reduced by the volume of the six spaces. When this decompressed sound wave is passed through the sound conduit O with the volume of the space n, the bass propagates only a little. Therefore, when sound waves are passed through the elastomer tube m made of a thin tube and the retrofit silicon tube d, the sound pressure rises by the same principle as the water pressure. As the sound pressure rises in the six spaces n, the entire bass refining component amplifies the bass frequency.

The next important thing is a method of guiding the amplified bass frequency to the sound conduit O without waste.
By increasing the length of the retrofit silicon tube d (about 6 mm to 8 mm) with the bass refined component D, the bass frequency can be delivered directly into the sound conduit, that is, the deterioration of the sound can be prevented.

A method of collecting bass frequencies in space c.
The soft tape g has a function of surrounding the outer wall of the bass purification component D, preventing the bass frequency in the space c from being dispersed, and increasing the sound pressure.

In order to maintain the sound pressure in the space c, it is most important to protect the airtightness other than the sound wave flowing out to the sound conduit O. Therefore, the upper lid E is required. The upper lid E has a role of fixing the bass purification component D and holding the sound pressure in the space c. Align with the space c entrance and attach with adhesive.

An ear tip P is attached to the sound conduit O.
Why does the bass reach the inner ear (cochlea)? The treble is transmitted by air vibration rather than the bass. Bass is difficult to transmit by air vibration, but it is transmitted by using substances (body fluids and bones). Taking advantage of this property, the size of the eartips is of utmost importance. Ear tips P that do not fit into the ear canal entrance halve the bass. That is, the bass is not transmitted to the cochlea unless it is in close contact with the ear canal (body fluid / bone conduction). It is most important to use a material having a shore hardness of 20 to 30 for the hardness of the ear tip P. Since the earphone of the present invention uses a speaker S with a slightly stronger treble range, if a hard ear tip that conveys the treble range is used, the bass range is halved and too high treble is transmitted, which is the aim of the earphone of the present invention. It means that it cannot be an earphone that delivers high-quality treble, midrange, and bass to the ear.

A Front housing B Back housing D Bass refined parts E Top lid S Speaker O Sound conduit P Ear tip a 1st sound path opening b 2nd sound path opening c Space d Retrofit silicon tube f Polyurethane foam or synthetic rubber foam g Soft tape m Elastomer tube n Space r Sound intake on the back of the speaker

Claims

A first sound path that takes in the sound on the front side of the speaker and a space for storing the bass purification parts on the back side of the speaker are provided, and the second sound path that allows the bass frequency extracted from the stored bass purification parts to flow through the sound conduit. Earphones featuring the provided structure
The earphone according to claim 1, wherein the space formed in contact with the second sound path opening is formed on the front housing side and serves to guide the extracted bass to the sound conduit by installing the bass purification component.
The bass refined parts are molded from an elastomer resin with a shore hardness of 20 to 30, and there are 6 spaces for the damping material at the upper entrance, 2 holes in the center with an inner diameter of 1 mm, and the other 4 holes. The earphone according to claim 1, wherein a thin tube having an inner diameter of 0.4 to 0.5 mm, an outer diameter of 1 mm, and a length of 2.8 mm is formed.
The earphone according to claim 3, wherein the two holes with an inner diameter of 1 mm in the center of the bass refined part are retrofitted with a silicon tube having an inner diameter of 0.5 mm, an outer diameter of 1 mm, and a length of 6 to 8 mm.
The earphone according to claim 3, wherein a low-pitched sound refined part and a damping material of foamed polyurethane or foamed synthetic rubber are loaded in the space of 6 upper entrances.
The earphone according to claim 3, wherein the bass frequency generated in the entire bass refined component can be guided to the sound conduit by covering the outer wall of the bass refined component with a soft tape.
The plastic top lid has 6 holes and is made with the specifications to align the holes with the 6 upper entrances of the bass refined parts, and it is glued with double-sided tape or adhesive, and the space of the front housing is in the combined state. The earphone according to claim 2, wherein the upper lid is integrated with the space of the front housing with an adhesive.