JPH0818509

Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0818509
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
wireless antenna used for karaoke and the like.
[0002]
2. Description of the Related Art Microphones used for karaoke and the like have conventionally
been connected to an amplifier by a cord, but the presence of a cord necessarily restricts the use
distance of the microphone to the length of the cord, which is inevitable. The code will be longer.
Longer cords can get in the way during use and can be difficult to store and maintain. Therefore,
cordlessization will progress rapidly. The orthodox of the cordless microphone is a radio wave
type using FM waves.
[0003]
According to the method of frequency-modulating the carrier wave with an audio signal and
radiating it from the antenna as radio waves, it is not necessary to make a code connection
between the microphone and the amplifier. Such problems will not occur. However, using radio
waves in this manner requires consideration of interference with other radio waves. In particular,
where there are many karaoke facilities provided adjacently, such as so-called karaoke boxes, this
is even more so.
01-05-2019
1
[0004]
Naturally, in adjacent facilities, interference is prevented by changing the frequency. However,
since the radio wave passes through the house construction, it picks up the radio wave from an
unexpected place, which may cause interference. Therefore, instead of using radio waves, optical
communication will be used. There is a basic optical communication system that uses infrared
light. This modulates the lighting current of the infrared light emitting diode with an audio signal,
and uses the change in the amount of infrared light produced thereby as a signal. On the
receiving side, infrared light is received by a light receiving element such as a phototransistor,
and a received signal is demodulated to obtain an audio signal.
[0005]
Because infrared light is a ray of light, it does not pass through the house construction, and thus
is a great advantage for interference. However, there are also problems that arise because of
light. That is, when the light emitting diode is attached to the microphone body, the user of the
microphone only needs to grip the portion without the light emitting diode, but if the light
emitting diode is concealed by hand, communication can not be performed. Further, since the
wireless microphone is used by hand, infrared rays may not reach the light receiving element
depending on the use place and the use angle.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of this point, and
an object of the present invention is to provide a wireless microphone in which infrared rays do
not reach the light receiving element depending on the use place and the use angle. It is a thing.
[0007]
Incidentally, those in which the light emitting diode is attached to the main body of the
microphone, those described in Japanese Utility Model Application Publication Nos. 61-162190,
62-26992 and 62-26993 are disclosed. is there.
01-05-2019
2
Those described in these publications use light emitting diodes for decoration or for checking the
power supply, and do not modulate light with an audio signal to emit light, so the above
problems of the present invention can not be solved. .
[0008]
The invention described in claim 1 is a wireless microphone including a light emitting diode for
optical communication, wherein light emission of the light emitting diode is modulated by an
audio signal. It is a wireless microphone characterized in that each light emitting diode is
attached to the microphone at an interval.
[0009]
According to a second aspect of the present invention, there is provided a wireless microphone
according to the first aspect, wherein a plurality of spaced light emitting diodes are attached to a
portion of a windscreen. .
[0010]
According to a third aspect of the present invention, there is provided a wireless microphone
according to the first aspect, wherein a plurality of spaced light emitting diodes are attached to a
lower end portion of the microphone main body. is there.
[0011]
According to a fourth aspect of the present invention, in the first aspect, a plurality of spaced
light emitting diodes are attached to both the windscreen portion and the lower end portion of
the microphone body. Wireless microphone characterized by
[0012]
The invention described in claim 5 is characterized in that, in the invention described in claim 4,
a pressure-sensitive switch which switches the circuit by sensing the pressure of the windscreen
when the part is gripped. A wireless microphone characterized in that the light emitting diode of
the lower end portion of the microphone main body emits light when a portion of the wind
screen is gripped by the pressure sensitive switch.
[0013]
According to a sixth aspect of the present invention, in the light emitting diode according to any
one of the first to fourth aspects, only a specific one of the plurality of light emitting diodes
01-05-2019
3
related to the tilt of the microphone body emits light. And a wireless microphone characterized
by switching to
[0014]
According to a seventh aspect of the present invention, in the sixth aspect, the gravity utilizing
switch mechanism is housed inside the microphone body, and the gravity utilizing switch
mechanism emits a specific light emitting diode. It is a wireless microphone characterized in that
[0015]
According to an eighth aspect of the present invention, in the seventh aspect according to the
seventh aspect, the switch mechanism for utilizing gravity according to the electrode attached to
the insulator in an arc shape and the electrode according to the inclination of the microphone
body. And a contact piece for changing the contact position with the contact.
[0016]
According to a ninth aspect of the present invention, in the seventh aspect, the switch mechanism
for utilizing gravity is arranged by radially arranging a plurality of electrodes in a closed
container and in the closed container. It is a wireless microphone characterized by containing an
appropriate amount of mercury.
[0017]
According to a tenth aspect of the present invention, in the eighth aspect, the weight is attached
to the lower end of the contact piece which changes the contact position with the electrode
according to the inclination of the microphone body. Wireless microphone.
[0018]
According to the first aspect of the present invention, when the plurality of light emitting diodes
attached at intervals to the wireless microphone emits light, the infrared rays from any of the
light emitting diodes become the light receiving element. It will be reached.
[0019]
According to the second aspect of the present invention, since the light emitting diode is
generally attached to the wind screen which can not be gripped, the infrared rays are not blocked
and the light receiving element can receive light more reliably. Become.
01-05-2019
4
[0020]
According to the third aspect of the present invention, when the microphone is used, the
transmission of the infrared rays to the light receiving element is surely made by the light
emitting diode attached to the place which is often located outside the user's hand. Become.
[0021]
According to the fourth aspect of the present invention, since the light emitting diode is attached
to both of the windscreen portion and the lower end portion of the microphone body, the
infrared rays are not intercepted at all, thereby the light receiving element The transmission of
infrared radiation to is more reliable.
[0022]
According to the fifth aspect of the present invention, since the light emitting diode of the lower
end portion of the microphone body can be made to emit light only when the user grips the
portion of the wind screen, the user can Even if it is an unnatural act that holds a part of the,
transmission of infrared rays is not interrupted for that.
[0023]
According to the sixth aspect of the present invention, when the user tilts the microphone, it is
possible to select the light emitting diode in a place where infrared light is most easily
transmitted to the light receiving element to emit light, so that the transmission efficiency is
good. can do.
[0024]
According to the seventh aspect of the present invention, the switching of the light emitting
diode can be reliably performed by the switch mechanism using gravity.
[0025]
According to the eighth aspect of the present invention, the light emitting diode can be reliably
switched by the contact piece moving according to the inclination of the microphone coming into
contact with the electrode corresponding to the inclination angle.
[0026]
According to the ninth aspect of the present invention, the mercury placed in the closed vessel
01-05-2019
5
shorts the electrode corresponding to the inclination of the microphone body, so the microphone
is strongly inclined by switching the light emitting diode by the electrode. Also, the light
receiving element can always capture infrared rays.
[0027]
According to the tenth aspect of the present invention, in the eighth aspect, the contact piece can
be biased by the gravity of the weight and pressed to the electrode side, so that the contact is
reliable. It becomes a thing.
[0028]
Embodiment An embodiment of the present invention will be described below with reference to
FIG.
1 is an infrared wireless microphone (hereinafter referred to as a microphone), and 2 is its main
body.
The main body 2 is a cylindrical body manufactured by die-casting of zinc, for example.
Although not shown, an amplifier, a modulator, and a rechargeable battery are housed inside the
main body 2.
A male screw is engraved on the upper end of the main body 2, and the microphone head 3 is
screwed to the male screw.
[0029]
The microphone head 3 is provided with a power switch 4 and a mesh 5.
The mesh 5 functions as a part of the wind screen 6 described below.
01-05-2019
6
On the upper part of the microphone head 3 is disposed a wind screen 6 which is formed in a
semi-spherical net shape, and is coupled to the microphone head 3 by an intermediate ring 7
provided therebetween.
Inside the wind screen 6, a continuous foam foam (urethane foam as an example) having a length
up to the mesh 5 of the microphone head 3 is stretched to perform a windshield function.
[0030]
The intermediate ring 7 is made of a belt-like metal plate having a U-shaped cross section, and
the opening thereof connects the outer periphery of the microphone head 3 and the wind screen
6.
Four light emitting diodes 8 and four pressure sensitive switches 9 are alternately arranged on
the intermediate ring 7 and connected to the internal circuit of the main body 2 or the
microphone head 3 respectively.
The light emitting diode 8 emits infrared light, and the pressure sensitive switch 9 senses an
external pressure applied thereto.
The sensitivity of the pressure sensitive switch 9 is such that it turns on when the user of the
microphone grips the microphone head 3.
[0031]
A cover 10 made of a translucent synthetic resin is attached to the lower end portion of the main
body 2, and four light emissions directed in the same direction as the light emitting diode 8
attached to the intermediate ring 7 are provided therein. A diode 11 is accommodated.
The light emitting diode 11 emits light while being switched with the light emitting diode 8
attached to the intermediate ring 7 by a circuit described below.
01-05-2019
7
[0032]
The lighting circuit of the light emitting diodes 8 and 11 will be described with reference to FIG.
A microphone unit 12 converts the vibration of the diaphragm into an audio current.
The microphone unit 12 is connected to the modulator 14 and the oscillator 15 in this order via
the microphone amplifier 13, and the output side of the oscillator 15 is connected to the drive
circuit 17 of the light emitting diodes 8 and 11 via the buffer 16.
[0033]
The cathodes of the four light emitting diodes 8 and 11 are connected to the output side of the
drive circuit 17.
The light emitting diodes 8 and 11 are attached in the same direction, and the fixed contacts of
the pressure sensitive switch 9 are connected to the respective anode sides.
The movable contact of the pressure sensitive switch 9 is in contact with the light emitting diode
8 in a state where pressure is not sensed, and is in contact with the light emitting diode 11 when
pressure is sensed.
[0034]
In this embodiment, since four light emitting diodes 8 and 11 are provided, four pressure
sensitive switches 9 are also provided.
Then, the four pressure sensitive switches 9 are formed in pairs, and the fixed contacts of the two
gravity switches 18 are connected to their movable contacts.
01-05-2019
8
The specific structure of the gravity switch 18 will be described later.
The movable contacts of the two gravity switches 18 are connected to the battery 19 via the
power switch 4 (see FIG. 1).
[0035]
FIGS. 3 and 4 show an example of the gravity switch 18.
In these figures, 20 is a substrate.
Two arc-shaped electrodes 21 and 22 are provided opposite to each other on one side of the
substrate 20. The electrodes 21 and 22 are copper foils plated with nickel or the like to increase
surface strength (abrasion resistance). Leads 23 and 24 are connected to the ends of the
electrodes 21 and 22, respectively.
[0036]
A shaft 25 passes through a central portion sandwiched between the electrodes 21 and 22. An
upper end of a contact piece 27 to which a weight 26 is attached at its lower end is axially
attached to the shaft 25. By this axial attachment, the contact piece 27 is moved by the weight
26 when the microphone 1 is inclined, and always maintains a vertical posture. On the other
hand, since the substrate 20 tilts with the main body 2 of the microphone 1, the contact piece 27
contacts either of the electrodes 21 and 22. Since the electrodes 21 and 22 are provided
opposite to each other, the contact piece 27 does not contact either of the electrodes 21 and 22
when the main body 2 of the microphone 1 is directed in the vertical direction.
[0037]
At least two gravity switches 18 of the above structure are provided inside the body 2 of the
01-05-2019
9
microphone 1 so that the directions of the axes 23 cross each other. Each gravity switch 18 may
be provided with a stopper of an appropriate structure so that the contact piece 27 does not
rotate too much.
[0038]
The circuit of FIG. 2 described above is the case where two are provided. When the structures
shown in FIGS. 3 and 4 correspond to the circuit of FIG. 2, the electrodes 21 and 22 become fixed
contacts, and the contact piece 27 becomes a movable contact.
[0039]
The microphone 1 configured as described above is used as follows. The power switch 4 is
turned on, and the light emitting diodes 8 and 11 on the side where the pressure sensitive switch
9 and the movable contact of the gravity switch 18 are in contact are put on standby. In this
state, when the diaphragm of the microphone unit 12 senses a voice, a voice current is generated
in the microphone unit 12 by the action. The voice current is amplified by the microphone
amplifier 13, frequency-modulated by the modulator 14, and then input to the oscillator 15. The
output signal of the oscillator 15 is supplied to the drive circuit 17 of the light emitting diode
through the buffer 16.
[0040]
As described above, since the movable contact of the pressure sensitive switch 9 contacts the
light emitting diode 8 when it does not sense pressure, the light emitting diode 8 emits light if
the user does not grasp the middle ring 7 part. When held, the light emitting diode 11 emits
light. Further, since this light emission is switched according to the inclination of the microphone
1 by the gravity switch 18, the light emitting diode 8 (or the light emitting diode 11) directed
upward of the main body 2 emits light.
[0041]
FIGS. 5 and 6 show another example of the gravity switch. The gravity switch 28 is formed by
01-05-2019
10
arranging a plurality of electrodes 30 radially at equal intervals inside a sealed cylindrical sealed
container 29 and forming a suitable amount of mercury 31 inside the sealed container 29. is
there. The electrode 30 is a combination of the yoke electrode 30a and the U-shaped electrode
30b at a distance so as not to contact with each other as shown in FIG. The lower part of the
electrode 30 is dipped in the mercury 31 during use of the microphone 1, and the yoke electrode
30 a and the U-shaped electrode 30 b of the dipped electrode 30 are shorted by the mercury 31
and turned on. .
[0042]
FIG. 7 is a circuit diagram when the gravity switch 28 shown in FIGS. 5 and 6 is used. The
difference between this circuit and the circuit shown in FIG. 2 is that the gravity switch 28 does
not function as a switch for switching the output side of the two pressure sensitive switches 9,
and the output side of each pressure sensitive switch 9 is turned on and off To function. For this
reason, each electrode 30 of the gravity switch 28 is connected in series to the pressure sensitive
switch 9. The other parts of the circuit are the same as those in FIG. 2, so the same reference
numerals are given and the description is omitted. In the figure, four electrodes 30 are shown.
[0043]
In the case where the gravity switch 28 is used, one or several electrodes 30 can be shorted by
appropriately determining the amount of mercury 31. In the example shown in FIG. 6, mercury
31 is used in such an amount that six electrodes 30 are provided and two of the electrodes 30
are shorted. In this case, the electrode 30 which is shorted by being immersed in the mercury 31
because the microphone 1 is inclined is connected to the light emitting diode 8 (11) facing the
light receiving element at the angle of the microphone 1.
[0044]
When the microphone 1 is used by hand, particularly when it is used for karaoke, the
microphone 1 is often inclined in accordance with the rhythm. In this case, since the light
emitting diodes 8 and 11 are always made to emit light by the action of the gravity switches 18
and 28, signal transmission to the light receiving element is surely performed.
01-05-2019
11
[0045]
Since the present invention is a wireless microphone configured as described above, signal
transmission to the light receiving element can be reliably performed by a plurality of light
emitting diodes spaced from each other. Become. Since the light emitting diode is disposed at the
windscreen portion and the lower end of the microphone body and switched by the gravity
switch to emit light, the light emitting diode at a portion where infrared rays do not reach the
light receiving element does not emit light. It is possible to prevent unnecessary power
consumption. In the case where the light emitting diode is switched by the pressure sensitive
switch, the light emitting diode at the lower end of the microphone body is made to emit light
only when the user grips the microphone head, so the light emitting diode provided in the
microphone head is always efficient Signal transmission will be possible.
[0046]
Brief description of the drawings
[0047]
1 is a front view of a wireless microphone to which the present invention is applied.
[0048]
2 is a circuit diagram showing a lighting circuit of the light emitting diode of FIG.
[0049]
3 is a front view showing an example of a gravity switch.
[0050]
4 is a side view of FIG.
[0051]
5 is a cross-sectional view showing another example of the gravity switch.
[0052]
6 is a front view showing the electrode structure of FIG.
01-05-2019
12
[0053]
7 is a circuit diagram showing a circuit using the gravity switch shown in FIG. 5 and FIG.
[0054]
Explanation of sign
[0055]
Reference Signs List 1 microphone 2 main body 3 microphone head 6 wind screen 7 middle ring
8 light emitting diode 9 pressure sensitive switch 11 light emitting diode 12 microphone unit 14
modulator 18 gravity switch 21 electrode 22 electrode 25 axis 26 weight 27 contact piece 28
gravity switch 29 closed container 30 electrode 31 mercury
01-05-2019
13