JPS6340954Y2 - - Google Patents
Info
- Publication number
- JPS6340954Y2 JPS6340954Y2 JP11834583U JP11834583U JPS6340954Y2 JP S6340954 Y2 JPS6340954 Y2 JP S6340954Y2 JP 11834583 U JP11834583 U JP 11834583U JP 11834583 U JP11834583 U JP 11834583U JP S6340954 Y2 JPS6340954 Y2 JP S6340954Y2
- Authority
- JP
- Japan
- Prior art keywords
- noise
- cord
- headphone
- contact
- loop
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Headphones And Earphones (AREA)
Description
【考案の詳細な説明】
この考案は、衝撃等の外部雑音が、コードの被
覆を伝わつて、振動板に直接達するのを防止した
ヘツドホンに関する。[Detailed Description of the Invention] This invention relates to a headphone that prevents external noise such as impact from directly reaching the diaphragm through the cord coating.
従来かかるコードを伝播する外部雑音を除去す
るには、コードの被覆材料として機械的内部損失
の多い材料か、または極めて軟質のプラスチツク
を使用したり、或はパツト部分の構造に工夫を加
えて雑音が直接振動板に伝わらぬようにしていた
が、前者の方法ではコード断線事故が多発した
り、後者では構造が複雑となり製造コストを上昇
させる欠点を有していた。 Conventionally, in order to eliminate external noise propagating through such cords, it is necessary to use materials with high mechanical internal loss or extremely soft plastics as the cord coating material, or to improve the structure of the parts to reduce noise. However, the former method resulted in frequent cord breakage accidents, and the latter method had the disadvantage of complicating the structure and increasing manufacturing costs.
本考案は第１図以下に示すごとく、ヘツドホン
コード３の一部分にループ部４，５と接点部６，
７とからなる折曲部８を設けたものである。（図
ではループ部、接点部とも２箇所の例を示した。）
第２図において、コード３の(A)端（プラグ側）
から伝播したノイズN1は接点部６において一部
（N2）は主ノイズとしてそのままループ５をコー
ド３に沿つて伝わり、残部のN3は接点部６から
逆相分N4と正相分N5とに分れ、コード３の中で
主ノイズN2と加算されるが、N4とN5とは相互
に逆相であるためキヤンセルされ、(B)側に伝播す
るにはN2のみとなり、結果的に減衰を受けるこ
ととなる。接点部７とループ部５においても同様
の作用が行なわれ、各接点部分で分散し各所でキ
ヤンセルしながら減衰し、結果的にコード３のＢ
端（ユニツト側）に伝わる雑音は大きく減衰され
ることになる。この減衰量（dB）は一組のルー
プ部と接点部とからなる折曲部の数に比例して増
加する。 As shown in FIG.
A bent portion 8 consisting of 7 is provided. (The figure shows two examples for both the loop part and the contact part.) In Fig. 2, the (A) end of cord 3 (plug side)
A part (N2) of the noise N1 propagated from the contact part 6 is transmitted as main noise along the loop 5 along the code 3, and the remaining part N3 is divided from the contact part 6 into a negative phase component N4 and a positive phase component N5. is added to the main noise N2 in code 3, but since N4 and N5 are in opposite phase to each other, they are canceled, and only N2 propagates to the (B) side, resulting in attenuation. It happens. A similar effect occurs at the contact portion 7 and the loop portion 5, and the attenuation is dispersed at each contact portion and canceled at various locations, resulting in the B of code 3.
Noise transmitted to the end (unit side) will be greatly attenuated. This amount of attenuation (dB) increases in proportion to the number of bends made up of a set of loop parts and contact parts.
今雑音エネルギーが接点部からコードの他の部
分に伝播する割合をα（α＜１）、折曲部の接点部
の全数をｎとすれば、各接点部ごとにノイズ信号
は（１−α）の大きさとなるため、全減衰量
（dB）は次式で表わされる。 Now, if the rate at which noise energy propagates from the contact part to other parts of the code is α (α < 1), and the total number of contact parts at the bend part is n, then the noise signal for each contact part is (1-α ), the total attenuation (dB) is expressed by the following formula.
減衰量＝20Iog（１−α）n （dB）
またコード内での機械的損失によつても減衰を
受けるので実際の減衰量は更に大きくなる。 Attenuation = 20 Iog (1-α) n (dB) Also, the actual attenuation is even larger because it is also attenuated by mechanical loss within the code.
本考案は上述の如き構成のコードを使用したヘ
ツドホンであつて、高価な、或は機械的強度の低
い材料でコードを作つたり、パツト部の構造を複
雑にする必要もなく、極めて簡単な構造で外部か
らコードに伝わる雑音を遮断し得るヘツドホンを
提供するものである。 The present invention is a headphone using a cord with the above-mentioned structure, and there is no need to make the cord from expensive or low mechanical strength material, or to complicate the structure of the part, and it is extremely simple. To provide a headphone whose structure can block noise transmitted to the cord from the outside.
第１図に本考案ヘツドホンの外観図、第２図は
本考案の要部を示す説明図である。
１，２はそれぞれヘツドホンユニツト、３はコ
ード、４，５はそれぞれ接点部、６，７はそれぞ
れループ部、８は折曲部である。
FIG. 1 is an external view of the headphone of the present invention, and FIG. 2 is an explanatory diagram showing the main parts of the present invention. 1 and 2 are headphone units, 3 is a cord, 4 and 5 are contact portions, 6 and 7 are loop portions, and 8 is a bent portion.
Claims (1)
ループ４と、接点部６とからなる折曲部８を、少
くとも１箇所以上設けたことを特徴とするヘツド
ホン。 In the neighborhood code 3 of headphone units 1 and 2,
A headphone characterized in that a bent portion 8 consisting of a loop 4 and a contact portion 6 is provided at at least one location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11834583U JPS6027591U (en) | 1983-07-28 | 1983-07-28 | headphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11834583U JPS6027591U (en) | 1983-07-28 | 1983-07-28 | headphone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6027591U JPS6027591U (en) | 1985-02-25 |
| JPS6340954Y2 true JPS6340954Y2 (en) | 1988-10-26 |
Family
ID=30272049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11834583U Granted JPS6027591U (en) | 1983-07-28 | 1983-07-28 | headphone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6027591U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018200860A (en) * | 2017-05-25 | 2018-12-20 | 紀元 佐藤 | Audio cable |
-
1983
- 1983-07-28 JP JP11834583U patent/JPS6027591U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6027591U (en) | 1985-02-25 |
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