JPS6325820Y2 - - Google Patents
Info
- Publication number
- JPS6325820Y2 JPS6325820Y2 JP1982001569U JP156982U JPS6325820Y2 JP S6325820 Y2 JPS6325820 Y2 JP S6325820Y2 JP 1982001569 U JP1982001569 U JP 1982001569U JP 156982 U JP156982 U JP 156982U JP S6325820 Y2 JPS6325820 Y2 JP S6325820Y2
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- magnetic yoke
- sound pressure
- pressure gradient
- acoustic
- 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
- 230000005520 electrodynamics Effects 0.000 claims description 7
- 230000010363 phase shift Effects 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Description
【考案の詳細な説明】
本考案は音圧傾度型の動電型音響変換器に関す
るもので、振動系（振動板、ボイスコイル）の質
量を増すことなく共振周波数oを低くすると同
時に、共振周波数oに於けるＱを高くすること
を目的とするものである。[Detailed description of the invention] This invention relates to a sound pressure gradient type electrodynamic acoustic transducer, which lowers the resonance frequency o without increasing the mass of the vibration system (diaphragm, voice coil), and at the same time The purpose is to increase the Q in o.
第１図は従来の音圧傾度型の動電型音響変換器
の断面を示すもので、共振周波数o及び共振周
波数oに於けるＱは振動板１のスチフネス、振
動板１に貼付けたボイスコイル２の質量及び、磁
気ヨーク３の内部の気室４の付加質量にて決定づ
けられるものであるが、振動板１のスチフネスを
小さくするためには振動板１を薄くすることが必
要であり、不安定なものとなり、ボイスコイル２
の質量を増すことは感度低下を招き不利であり、
また磁気ヨーク３の内部の気室４の付加質量を増
すためにはこの気室４を大形化しなければならな
いなどの欠点があつた。 Figure 1 shows a cross section of a conventional sound pressure gradient type electrodynamic acoustic transducer, where the resonance frequency o and Q at the resonance frequency o are the stiffness of the diaphragm 1 and the voice coil attached to the diaphragm 1. This is determined by the mass of the diaphragm 2 and the additional mass of the air chamber 4 inside the magnetic yoke 3, but in order to reduce the stiffness of the diaphragm 1, it is necessary to make the diaphragm 1 thinner. It becomes stable and voice coil 2
Increasing the mass of the sensor is disadvantageous because it causes a decrease in sensitivity.
Another disadvantage is that in order to increase the additional mass of the air chamber 4 inside the magnetic yoke 3, the air chamber 4 must be made larger.
本考案はこのような欠点を除去したものであ
り、広帯域で高感度の比較的小形の音圧傾度型の
動電型音響変換器を得ることを目的とするもので
ある。以下本考案の一実施例を第２図を用いて説
明する。図中５は振動板、６は振動板５に貼付け
られたボイスコイル、７は磁気ヨーク、８は磁気
ヨーク７の側部に設けられた移相回路の音響端子
を構成する通路、９は磁気ヨーク７の側面に貼付
けられた音響抵抗材、１０は移相回路音響端子を
構成する通路８の一部に設けられた溝である。１
１は円柱状磁気、１２は磁石支持材である。この
場合、磁気ヨーク７の側面に貼付けられた音響抵
抗材９と移相回路音響端子を構成する通路８の一
部に設けられた溝１０によつて構成される隙間１
０ａに相当する付加質量が増すため共振周波数
oが低くなると同時に、共振周波数oに於ける
Ｑが高くなる。なお溝１０は磁気ヨーク７を形成
時に同時に形成でき製造上も複雑になることがな
い。また溝１０は磁気ヨーク７の外周の一部に設
ければよいので音響抵抗材９をヨーク７に固定す
る際にも支障がない。 The present invention eliminates these drawbacks, and aims to provide a relatively small sound pressure gradient type electrodynamic acoustic transducer that has a wide band and high sensitivity. An embodiment of the present invention will be described below with reference to FIG. In the figure, 5 is a diaphragm, 6 is a voice coil attached to the diaphragm 5, 7 is a magnetic yoke, 8 is a passage forming an acoustic terminal of a phase shift circuit provided on the side of the magnetic yoke 7, and 9 is a magnetic The acoustic resistance material 10 is attached to the side surface of the yoke 7, and 10 is a groove provided in a part of the passage 8 constituting the phase shift circuit acoustic terminal. 1
1 is a cylindrical magnetic field, and 12 is a magnet support material. In this case, a gap 1 is formed by an acoustic resistance material 9 attached to the side surface of the magnetic yoke 7 and a groove 10 provided in a part of the passage 8 that constitutes the phase shift circuit acoustic terminal.
The resonant frequency increases because the additional mass corresponding to 0a increases.
As o becomes lower, Q at the resonant frequency o becomes higher. Note that the groove 10 can be formed at the same time as the magnetic yoke 7 is formed, and manufacturing is not complicated. Further, since the groove 10 may be provided in a part of the outer periphery of the magnetic yoke 7, there is no problem when fixing the acoustic resistance material 9 to the yoke 7.
以上のように本考案によれば比較的小形にして
広帯域、高感度の音圧傾度型の動電型音響変換器
を提供することができる。 As described above, according to the present invention, it is possible to provide a comparatively small, broadband, high-sensitivity sound pressure gradient type electrodynamic acoustic transducer.
第１図は従来の音圧傾度型の動電型音響変換器
の側断面図、第２図は本考案の一実施例である音
圧傾度型の動電型音響変換器の側断面図である。
１，５……振動板、２，６……ボイスコイル、
３，７……磁気ヨーク、８……移相回路音響端子
を構成する通路、９……音響抵抗材、１０……
溝、１０ａ……隙間、１１……円柱状磁石。
Figure 1 is a side sectional view of a conventional sound pressure gradient type electrodynamic acoustic transducer, and Figure 2 is a side sectional view of a sound pressure gradient type electrodynamic acoustic transducer that is an embodiment of the present invention. be. 1, 5...Diaphragm, 2,6...Voice coil,
3, 7... Magnetic yoke, 8... Passage constituting the phase shift circuit acoustic terminal, 9... Acoustic resistance material, 10...
Groove, 10a... Gap, 11... Cylindrical magnet.
Claims (1)
路を設けるとともに前記通路に付加質量を増加す
るための隙間を設けたことを特徴とする音圧傾度
型の動電型音響変換器。 1. A sound pressure gradient type electrodynamic acoustic transducer, characterized in that a magnetic yoke is provided with a passage forming an acoustic terminal of a phase shift circuit, and a gap is provided in the passage for increasing additional mass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP156982U JPS58104079U (en) | 1982-01-08 | 1982-01-08 | Sound pressure gradient type electrodynamic acoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP156982U JPS58104079U (en) | 1982-01-08 | 1982-01-08 | Sound pressure gradient type electrodynamic acoustic transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58104079U JPS58104079U (en) | 1983-07-15 |
| JPS6325820Y2 true JPS6325820Y2 (en) | 1988-07-13 |
Family
ID=30014574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP156982U Granted JPS58104079U (en) | 1982-01-08 | 1982-01-08 | Sound pressure gradient type electrodynamic acoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58104079U (en) |
-
1982
- 1982-01-08 JP JP156982U patent/JPS58104079U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58104079U (en) | 1983-07-15 |
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