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原帖由 今夜星光 于 2009-6-11 05:08 发表 
呵呵，网上查了一下，用利兹线做音圈的专利是1982年被老外申请的，尽管利兹线的发明有一百年了。而且有一些这方面的研究工作，尽管没见有商品喇叭应用利兹线做音圈。下面的网页是这个专利的简介。
http://www.f ...
查了一下，还真有这篇文章：
Loudspeaker Litz Wire| Studies of loudspeaker components most often concentrate on the functions that add or detract from the acoustically measurable performance aspects of loudspeakers - such as cones, suspensions, or magnet and motor assemblies. On the other hand, application of litz wire into the loudspeaker design is not well documented. Yet the litz wire has a profound impact on reliability and has a propensity to cause problems such as unacceptable extraneous noise. After a review of classical theory on the vibration of strings, bars and elasticity one will surmise that understanding the vibration of litz wire is not trivial. This paper reviews a loudspeaker case study and the ramifications of using behaved and not so well behaved litz wire. |
上面是摘要，
INTRODUCTION
Loudspeaker litz wire (sometimes called loudspeaker lead wire, tinsel wire or pigtails) is the section of flexible wire
between the loudspeaker terminals and the voice coil. The sole purpose of the litz wire used in loudspeakers is to conduct the electrical signal from a power amplifier to the voice coil, typically through a terminal attached to the frame of the loudspeaker. Since the voice coil is in motion, and the terminal is stationary, a section of the litz wire must remain flexible while the voice coil and moving assembly travels through its potential excursion cycle. A literature search of traditional loudspeaker design textbooks and papers finds few design guidelines on the use and behavior of litz wire in loudspeakers [1] [2] [3] [4] [5]. While Borwick [6] touches on the basic issues of “lead dress” and in relation to mid-range cone breakup Colloms [7] suggests “the lead out wires to the motor coil must be carefully considered”, neither gives explanation of other problems - or solutions.
Loudspeaker designers have typically selected litz wire for specific applications on derivative experience. The choice of litz wire and its dress assembly (layout) may only come under scrutiny when new loudspeaker designs vary from traditional geometry, resulting in the litz wire behaving in an unexpected manner. For example, where continually greater excursions are required for large volume displacements, the litz wire’s range of motion places exceedingly higher stress on each successive loudspeaker design. Add to that the perfunctory
depth constraints driven by limited package space (for example as in automotive Original Equipment Manufacturing), the available space between spider, cone and frame is diminished. This makes the choice of litz wire and its dress ever more difficult.
This paper reviews the mechanics of different types of litz wire, dress assembly options, and a case study of a loudspeaker with a free span of litz wire between moving assembly and terminal. It is observed in the case study loudspeaker that different types of litz wire exhibit different motional behavior under the same design and operating conditions. It is shown how an improvement may be obtained by using one type of litz wire as an alternative to another.
看了简介，这里说的LITZ线，其实是说扬声器音圈和接线端子之间的软多股铜线，又叫锦丝线、猪尾巴线等等。与音圈无任何关系。 |
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发表于 2009-6-10 14:32
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