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FIELD OF THE INVENTION The present invention relates to a speaker having a diaphragm (or a
diaphragm) in which a plurality of and multi-layered (multi-layered) voice coils formed by etching
thin films and foils on a resin film are received. Is the area of the vibrating part that it has. It
relates to the configuration and structure of thickness and ease of vibration. [Background of the
invention] A conventional device is called a so-called "gum-thin type speaker" and pastes voice
coils uniformly distributed on a thin film diaphragm as described in Japanese Patent Publication
No. 35-10420. The diaphragm is uniformly driven by being placed in a magnetic circuit
corresponding to the shape of the voice coil. However, while a constant diaphragm area is
required according to the lower limit of the reproduction frequency, the directivity is degraded in
the high range because of the uniform driving on the entire surface. [Object of the invention] An
object of the present invention is to provide a loudspeaker capable of reproducing the entire
band with flat sound pressure frequency characteristics and having high directivity up to high
frequency with a single diaphragm (diaphragm). . [Summary of the invention] In order to improve
the directivity of middle and high sound, it is necessary to reduce the area of the vibration unit
for middle and high sound, and in order to share the low frequency diaphragm and use it as one
for middle and high sound The small area of a part of the diaphragm is made thin and easy to
vibrate with a small signal input, and the problem is solved by using this part as a vibrator for
high and high. An embodiment of the present invention will be described below with reference to
FIG. A part of the diaphragm 1 and a portion surrounded by a broken line is used as a diaphragm
8 for middle and high frequencies, and is formed of a voice coil 2 of multiple layers and a
multilayer voice coil 7 for middle and high frequencies. When the bass is vibrated, the entire
diaphragm 1 (including the diaphragm for middle and high frequency range) is driven, and when
the middle and high frequency is vibrated, only the diaphragm for middle and high frequency 8
is driven. The middle-high frequency range diaphragm 8 is a part of the diaphragm 1, but its
thickness is small compared with this, and even a small electric input signal is driven with high
efficiency, and the area is also small. Further, in order to drive the middle to high frequency
diaphragm 8 with high efficiency and to improve the sound quality, an edge may be formed in
the circumferential concave portion (broken line portion). FIG. 2 is a cross-sectional view of the
vibrating membrane of FIG. 1. 0 [Effect of the Invention] According to the present invention, an
appropriate vibrating portion can be driven by an input signal frequency with a single vibrating
plate (vibrating membrane) Therefore, the directivity is improved over the entire band.
Brief description of the drawings
FIG. 1 is a front view of a diaphragm (diaphragm film) according to an embodiment of the
present invention and a network connected thereto, and FIG. 2 is a cross-sectional view of the
diaphragm (vibration film) of the present invention.
Reference Signs List 1 diaphragm 2 multi-layer voice coil 7 multi-layer voice coil for middle and
high frequency region 8 diaphragm for middle and high frequency region 9 network for low
frequency region 10 network for high and low frequency region