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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic device using an earphone.
2. Description of the Related Art In recent years, portable acoustic devices (small cassette
recorders etc.) have been brought into trains more often, but in crowded trains etc. the sound
emitted from the acoustic devices has become a social problem In the situation. Conventionally,
for the purpose of using in the place where such ambient sound exists, a volume automatic
control device that automatically controls the volume of an acoustic device or the like according
to the magnitude of the ambient sound is considered, and the ambient sound is detected It has
been proposed to attach the microphones to a part of the headphone support (Japanese Utility
Model Application No. 57-56083) and to attach the microphone to the headphone main body
(Japanese Patent Application Laid-Open No. 58-27413).
As another means of adjusting the volume, a volume adjustment mechanism is provided in the
middle of the lead wire connecting the headphones, the earphones and the acoustic device
without relying on such means for detecting the ambient sound, as needed. It is also
commercially available that the volume is adjusted manually.
However, due to the recent improvement in performance and downsizing of the earphones, the
earphones have been used exclusively in trains etc. in place of so-called headphones.
Since it is necessary to prevent the sound from being heard by anyone other than the user in the
train, etc., the shape of this earphone is preferred to have good adhesion to the earhole, and as a
result, a microphone for detecting ambient sound is used. It becomes structurally difficult to
attach to the main body of the earphone, and the microphone attached to it is not so miniaturized
even though the earphone has been miniaturized, so attaching the microphone makes the
earphone It has become impractical because of its heavy weight and poor adhesion to the ear
Further, according to the conventional method, the positions of the earphone, the headphone and
the microphone are too close to each other, and in these cases, the microphone has directivity.
There is also a problem that it is necessary to provide a filter circuit in the unit.
Generally speaking, sound energy also includes high-low tones represented by frequencies and
high-low tones represented by amplitude. Generally, these are combined in a complicated
manner, so that the mechanism of the sound pickup device, It is often difficult to allow the sound
generator to feed back and adjust the output freely in relation to the installation location etc.
In order to improve these points, a microphone with a clip is placed on the cord portion between
the earphone and the acoustic device, and clothes, the case of the acoustic device, and a bag at
the time of use By installing and fixing the microphone in a suitable place such as a part by using
the clip, it is possible to reduce the weight of the earphone itself and to reliably detect the
ambient volume and to be comfortable without using the filter circuit. It became possible to get
the volume.
DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention will be described based
on the illustrated embodiment.
The embodiment shows an example in which the microphone with clip is attached to the middle
part of the cord, and the shape, attachment position and the like of the clip are not limited by this
FIG. 1 is a perspective view of a sound volume detection microphone constituting the present
invention with a clip attached thereto.
The clip 1 is made of, for example, a metal material having spring elasticity such as phosphor
The shape of the clip may be like a tie pin, like a clothespin, or a screw fixed type.
FIG. 2 is a perspective view of a volume detection microphone integrated with a volume control
dial and attached to a clip. This volume control dial may be used for a volume detection
microphone or may be that of an acoustic device.
。 In use, a place where the ambient sound can be detected properly is selected, and the clip is
fixed to clothes, a handbag or the like. When the adjustment of the ambient sound is not
sufficient, adjustment can be made more surely by adjusting the dial if the type is integrated with
the volume control dial.
Brief description of the drawings
1 is a perspective view of the sound volume detection microphone constituting the present
invention with a clip attached.
FIG. 2 is a perspective view of a volume detection microphone integrated with a volume
adjustment dial and attached to a clip.
3 is a block diagram of a circuit in the acoustic device in the case of implementing the present
Explanation of sign
Reference Signs List 1 clip 2 microphone for volume control 3 sound collection port of
microphone 4 cord of sound device 5 volume control dial
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jph04112592, description
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