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JP2000232416

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DESCRIPTION JP2000232416
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wireless microphone device using a light beam such as infrared light, and more particularly to a
hand-held wireless microphone device.
[0002]
2. Description of the Related Art FIG. 2 is a schematic view showing a state in which a
conventional handheld wireless microphone device is used indoors. In the figure, a handheld
wireless microphone device 1 is provided with a light emitting unit 3 at the lower part of a
housing 2. The light emitting unit 3 is provided therein with, for example, an infrared generation
circuit, and emits infrared light modulated by the sound received by the voice input unit 4 of the
wireless microphone device 1. On the other hand, a light receiver 5 for receiving a light beam
emitted from the light emitting unit 3 of the wireless microphone device 1 is provided at a
suitable position on a ceiling or wall around the wireless microphone device 1, and the light
received by the light receiver 5 is It is sent to an appropriate demodulation circuit and
demodulated to the original voice and music.
[0003]
However, since the light emitting unit 3 usually has directional characteristics, the light from the
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light emitting unit 3 must always be directed to the light receiving unit 5 in order to
communicate without interruption of voice and music. In order to do so, it is sufficient for the
user to be always careful about the orientation and position of the wireless microphone device 1,
but this is only annoying for the user. Therefore, the light from the light emitting unit 3 is
attached by attaching a plurality of light emitting elements with different directions in the light
emitting unit 3, attaching a reflector on the front surface or the periphery of the light emitting
element, or increasing the number of light receivers 5. I was trying to be sure to receive light.
[0004]
However, increasing the number of light emitting elements increases power consumption, and
increasing the number of light emitting elements and light receivers leads to an increase in cost.
Also, by disposing a reflector around the light emitting element, the width and direction of the
light emitted from the light emitting unit 3 can be adjusted to a certain extent, but only by
disposing the reflector around the light emitting element It is difficult to ensure that the light
emitted from the unit 2 reaches the light receiver 5. Furthermore, since the light emitting unit 3
is provided in the lower part of the housing 2 of the wireless microphone device 1, there arises a
serious problem that the user can cover the light emitting unit 3 by hand and communication
becomes impossible. There is.
[0005]
SUMMARY OF THE INVENTION The present invention has been proposed in view of the
disadvantages of the known wireless microphone device, and has a structure in which the light
emitted from the light emitting portion is reliably received. Intended to provide.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to
claim 1 of this application is a modulation according to the sound received by the microphone
element in an audio input unit in which the microphone element is accommodated. And a light
emitting element for emitting the light.
[0007]
Preferably, a plurality of the light emitting elements are arranged around the microphone
element, and the plurality of light emitting elements are arranged such that at least one of the
light emitting elements can be seen from at least one light receiver. Is particularly desirable.
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[0008]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a partial cutaway view
schematically showing the configuration of an embodiment of a wireless microphone device
according to the present invention.
In the figure, the same reference numerals as in FIG. 2 indicate the same or similar components.
In FIG. 1, a plurality of light emitting elements 7 are disposed inside an audio input unit 4
provided on the top of a housing 2 of the wireless microphone device 1.
The outside of the voice input unit 4 is covered with a coarse net-like windscreen 6, and a
plurality of light emitting elements 7 are attached to the inside of the window screen 6 with a
microphone element (not shown) as a center.
[0009]
Light emitted from at least one of the plurality of light emitting elements 7 is received by at least
one light receiver 5 mounted on a wall or a ceiling, regardless of the normal use state of the
microphone device 1 To ensure that each light emitting element 7 emits light towards the ceiling
in a different direction in a plane perpendicular to the longitudinal axis 8 of the microphone
device 1 and obliquely upward with respect to said plane Be done. In other words, the
arrangement of the plurality of light emitting elements 7 in positional relationship with the light
receiver 5 so that at least one of the light emitting elements 7 is always visible from the at least
one light receiver 5 in the normal use state of the microphone device 1 Is determined.
[0010]
In consideration of a general use situation, the angle between the light emitting direction from
the light emitting element 7 and the longitudinal axis 8 of the wireless microphone device may
be about 45 degrees. However, since the attachment of the light emitting element 7 is restricted
by the shape of the wind screen and the shape of the microphone element housed in the inside
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thereof, the angle between the light emitting direction from the light emitting element 7 and the
major axis 8 is 30 degrees. Desired values such as 60 degrees and 90 degrees can be taken. This
90 degree angle is a lateral light emission condition, which is a particularly effective angle for
delivering light towards the surrounding wall.
[0011]
It is not necessary to arrange the light emitting element 7 all around the microphone element,
and when the display on the side to be made the user side of the microphone device 1 is given to
the housing 2 in advance, the light emitting element 7 may not be arranged. Further, in the
present invention, the term "voice" includes not only human voice and musical instrument sound
but also signals of all frequencies that can be picked up by the microphone element.
[0012]
As is apparent from the description of one embodiment above, the invention according to claim 1
is characterized in that the light emitting element is above or diagonally above the wireless
microphone device in a normal use condition. Since it is generally known that sound can not be
collected when the voice input unit is covered with a hand, the user's hand does not cover the
light emitting element, and the probability of the light emitting element seeing through the light
receiver increases. This reduces the risk of loss of optical communication between the
microphone device and the light receiver, and thus has the particular effect of being able to
increase the reliability of communication.
[0013]
The inventions according to claims 2 and 3 can further increase the probability as a result of
arranging a plurality of light emitting elements, so that the number of light emitting elements can
be reduced if the same reliability as the conventional one is ensured. The effect of being able to
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