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    • 82. 发明公开
    • LOW TCR WIRE IN HIGH POWER AUDIO COILS
    • 疯狂麻省理工学院麻省理工学院温哥华医学研究所(FÜRHOCHLEISTUNGSAUDIOSPULEN)
    • EP0792569A4
    • 2004-12-29
    • EP95932552
    • 1995-09-20
    • JBL INC
    • BUTTON DOUGLAS J
    • H04R9/04H04R25/00C22C21/06
    • H04R9/046
    • For electric coil windings, particularly in moving coils of heavy duty bass loudspeaker or other electro-acoustic transducer, the present invention has found metallic materials, as alternatives to copper or aluminum in the voice coil wire, that can provide increased available maximum SPL (sound pressure level) exceeding an empirical limit, just under 120 dB/lm, that has been found to apply to various loudspeakers of known art regardless of efficiency and structural differences. By selecting wire material for low TCR (temperature coefficient or resistance) along with suitable resistivity and density, rather than for low resistivity alone which has conventionally dictated copper or aluminum, the present invention has led to the identification of new wire materials that can increase the available SPL. Such materials include alloys of aluminum containing between two and five component basic metals selected from the following group: magnesium, silicon, manganese, zinc and copper. The alloy AlMg (3.5 %) in extruded form yields maximum SPL 1.5 dB above that of pure aluminum and 3.32 dB above that of pure copper (see Fig. 2).
    • 对于电线圈绕组,特别是在诸如重型低音扬声器或其他电声换能器的音圈的移动线圈中,本发明已经发现金属材料作为音圈线中的铜或铝的替代物,其可以提供 增加可用的最大SPL(声压级)超过仅在120dB / 1m以下的经验极限,已被发现适用于已知技术的各种扬声器,而不管效率和结构差异。 通过研究有关限制最大可达到SPL的音圈结构和设计因素的这种限制和理论分析,已经开发出了一种新的选择音圈线材的基础。 通过选择用于低TCR(电阻温度系数)的线材以及适当的电阻率和密度,而不是单独用于传统规定的铜或铝的低电阻率,本发明已导致鉴定新的线材,其可以增加 可用SPL。 这种材料包括含有选自以下组中的两种和五种组分碱性金属的铝合金:镁,硅,锰,锌和铜。 挤出形式的合金Al Mg(3.5%)产生的最高SPL比纯铝高1.5dB,比纯铜高3.32dB。
    • 89. 发明公开
    • LOUDSPEAKER, APPARATUS COMPRISING THE SAME, AND METHOD OF OPERATING A LOUDSPEAKER
    • EP3355590A1
    • 2018-08-01
    • EP17153225.2
    • 2017-01-26
    • Vestel Elektronik Sanayi ve Ticaret A.S.
    • DERELI, UlasCERRAHOGLU, Dursun Sedat
    • H04R7/12H04R9/02
    • H04R9/046H04R1/24H04R3/14H04R7/12H04R2209/041H04R2307/207
    • The present invention provides a loudspeaker (10) at least comprising a field coil (4), a plurality of voice coils (6a, 6b, 6c) having different numbers of windings from each other, and a diaphragm (8) having a mechanically adjustable size. The invention also provides an apparatus at least comprising such a loudspeaker, as well as a variable voltage and/or current source (24) connected to the field coil (4), a voice coil drive circuit (26) switchably connectable to at least one of the plurality of voice coils (6a, 6b, 6c), and a mechanical actuator (28) connected to the diaphragm (8) for adjusting its size. The apparatus may further comprise a controller (30, 30a, 30b) of the variable voltage and/or current source (24), of the voice coil drive circuit (26) and of the mechanical actuator (28). Such a controller (30) is configured, in response to a frequency of an input electronic audio signal, to vary the voltage and/or current supplied to the field coil (4) by the variable voltage and/or current source (24) in order to vary the strength of a magnetic field produced by the field coil (4), to select at least one of the plurality of voice coils (6a, 6b, 6c) to be driven by the voice coil drive circuit (26), and/or to control the mechanical actuator (28) to adjust the size of the diaphragm (8). The invention also provides a method of operating a loudspeaker in such a manner. Thus the loudspeaker (10) is effectively an adaptive loudspeaker, which can become any one of a woofer, a mid-range speaker or a tweeter, according to how it is adjusted and controlled. This obviates the need to provide a separate woofer, mid-range speaker and tweeter to cover the whole range of normal human hearing.