JPH0818509A - Wireless microphone - Google Patents

Abstract

PURPOSE:To obtain the wireless microphone in which no effect is caused on the transmission of an infrared ray even when the microphone is tilted when the microphone is used in a hand. CONSTITUTION:Plural light emitting diodes 8, 11 emitting an infrared ray are provided and then the plural light emitting diodes 8, 11 are fitted on an outer circumference or an inside of the microphone 1 at an interval. Thus, the optical communication to a light receiving element is surely conducted by using the plural light emitting diodes 8, 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless microphone used for karaoke or the like.

[0002]

2. Description of the Related Art Conventionally, a microphone used for karaoke has been connected to an amplifier by a cord. However, if there is a cord, the use distance of the microphone is restricted by the length of the cord. It will be long. If the cord becomes long, it will be an obstacle during use, and storage and maintenance will be complicated. This is where the cordless move is made. An orthodox type of cordless microphone is a radio wave type that uses FM waves.

According to the method in which a carrier wave is frequency-modulated with an audio signal and the electric wave is radiated from an antenna as an electric wave, it is not necessary to connect a microphone and an amplifier with a cord. Such problems will not occur. However, when radio waves are used in this way, it becomes necessary to consider interference with other radio waves. This is especially true where many karaoke facilities are provided adjacent to each other, such as a so-called karaoke box.

[0004] Naturally, in adjacent equipment, interference is prevented by changing the frequency. However, since the radio waves pass through the house structure, they pick up radio waves from unexpected places, which may cause interference. Therefore, instead of using radio waves, optical communication will be used. As a basic optical communication system, there is one using infrared rays. This is to modulate the lighting current of the infrared light emitting diode with a voice signal and use the resulting change in the amount of infrared light as a signal. The receiving side receives infrared rays through a light receiving element such as a phototransistor and demodulates the received signal to obtain an audio signal.

Since infrared rays are rays of light, they do not pass through the building structure, which is a great advantage for interference. However, there are also problems caused by light rays. That is, when the light emitting diode is attached to the microphone body, the user of the microphone only has to grasp the part without the light emitting diode, but if the light emitting diode is hidden by the hand, communication cannot be performed. Further, since the wireless microphone is used by hand, infrared rays may not reach the light receiving element depending on the place of use and the angle of use.

[0006]

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 place of use and the angle of use. .

A microphone having a light emitting diode attached to its main body is disclosed in Japanese Utility Model Publication Nos. 61-162190, 62-26992, and 62.
No. 26993 has been disclosed. The publications described in these publications use a light emitting diode for decoration or power supply confirmation, and are not intended to emit light after being modulated by an audio signal, and therefore the above problems of the present invention cannot be solved. .

[0008]

According to another aspect of the present invention, there is provided a wireless microphone including a light emitting diode for optical communication, wherein the light emission of the light emitting diode is modulated by an audio signal. The wireless microphone is characterized in that a diode is attached to the microphone at intervals.

A second aspect of the present invention is a wireless microphone according to the first aspect, wherein a plurality of light emitting diodes provided at intervals are attached to a wind screen portion. .

According to a third aspect of the present invention, there is provided a wireless microphone according to the first aspect, wherein a plurality of light emitting diodes provided at intervals are attached to a lower end portion of a microphone body. is there.

According to a fourth aspect of the present invention, in accordance with the first aspect, a plurality of light emitting diodes provided at intervals are attached to both the windscreen portion and the lower end portion of the microphone body. It is a wireless microphone characterized by.

According to the invention described in claim 5, in the invention described in claim 4, a pressure sensitive switch is provided in a part of the wind screen for switching the circuit by sensing the pressure when the part is gripped. A wireless microphone is provided, wherein a light emitting diode at a lower end portion of a microphone body emits light when a windscreen portion is gripped by the pressure sensitive switch.

According to a sixth aspect of the present invention, in the light emitting device according to any one of the first to fourth aspects, only a specific one of the plurality of light emitting diodes, which is related to the inclination of the microphone body, emits light. It is a wireless microphone characterized by switching to.

According to a seventh aspect of the present invention, in the structure according to the sixth aspect, a switch mechanism for gravity use is housed inside the microphone body, and the specific light emitting diode emits light by the switch mechanism for gravity use. It is a wireless microphone characterized by being adapted to.

According to the invention described in claim 8, in the invention described in claim 7, the switch mechanism utilizing gravity is provided.
The wireless microphone is characterized in that the wireless microphone is formed by an electrode attached in an arc shape on an insulator and a contact piece that changes a contact position with the electrode according to the inclination of the microphone body.

According to the invention described in claim 9, in the invention described in claim 7, the switch mechanism utilizing gravity is
While arranging a plurality of electrodes radially in a closed container,
The wireless microphone is characterized by being formed by putting an appropriate amount of mercury in the closed container.

The invention described in claim 10 is the invention according to claim 8.
In the wireless microphone, the weight is attached to the lower end of the contact piece that changes the contact position with the electrode according to the inclination of the microphone body.

[0018]

According to the first aspect of the present invention, the infrared rays from any one of the light emitting diodes reach the light receiving element by emitting light from a plurality of light emitting diodes mounted at intervals in the wireless microphone. become.

According to the second aspect of the invention, since the light emitting diode is attached to the wind screen which is generally not gripped, infrared rays are not blocked and the light receiving element receives light more reliably. Become.

According to the third aspect of the present invention, when the microphone is used, the light emitting diode mounted in a place which is often located outside the user's hand ensures transmission of infrared rays to the light receiving element. Become.

According to the invention as set forth in claim 4, since the light emitting diode is attached to both the wind screen portion and the lower end portion of the microphone body, the infrared ray is not blocked at all. Infrared transmission to the will be more reliable.

According to the invention of claim 5, the light emitting diode at 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. Even if an unnatural action such as grasping the part of is held, the infrared transmission is not interrupted.

According to the sixth aspect of the present invention, when the user tilts the microphone, the light emitting diode in the place where infrared rays are most easily transmitted to the light receiving element can be selected to emit light, so that the transmission efficiency is improved. can do.

According to the seventh aspect of the present invention, the switching of the light emitting diodes is surely performed by the switch mechanism utilizing gravity.

According to the invention described in claim 8, since the contact piece which moves according to the inclination of the microphone comes into contact with the electrode corresponding to the inclination angle, it is possible to reliably switch the light emitting diode.

According to the invention described in claim 9, since mercury contained in the closed container short-circuits the electrode corresponding to the inclination of the microphone body, the electrode is switched between the light-emitting diodes to incline the microphone violently. However, the light receiving element can always capture infrared rays.

According to the invention described in claim 10, in the structure described in claim 8, since the contact piece can be urged by the gravity of the weight to be pressed to the electrode side, the contact can be ensured. It becomes a thing.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 is an infrared wireless microphone (hereinafter referred to as a microphone), and 2 is its main body. The main body 2 is a tubular body manufactured by, for example, zinc die casting. Although not shown, an amplifier and a modulator, a rechargeable battery, and the like 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 attached to the male screw by screwing.

The microphone head 3 is provided with a power switch 4 and a mesh 5. The mesh 5 functions as a part of a wind screen 6 described below. A windscreen 6 formed in a hemispherical shape with a mesh is arranged on the upper part of the microphone head 3, and is connected to the microphone head 3 by an intermediate ring 7 provided therebetween. Inside the wind screen 6, an open-cell foam material (urethane foam as an example) having a length up to the mesh 5 of the microphone head 3 is stretched to provide a windshield effect.

The intermediate ring 7 is made of a strip-shaped metal plate having a U-shaped cross section, and its opening connects the outer peripheral portions of the microphone head 3 and the windscreen 6. Four light emitting diodes 8 and four pressure sensitive switches 9 are alternately arranged on the intermediate ring 7, and are connected to the internal circuit of the main body 2 or the microphone head 3, respectively. The light emitting diode 8 emits infrared rays,
The pressure-sensitive switch 9 senses external pressure applied thereto. The sensitivity of the pressure sensitive switch 9 is set to be on when the microphone user grips the microphone head 3.

A cover 10 made of a semitransparent synthetic resin is attached to the lower end of the main body 2, and four light-emitting devices 8 mounted in the same direction as the light-emitting diodes 8 attached to the intermediate ring 7 are provided inside the cover 10. The diode 11 is housed.
The light emitting diode 11 is switched to the light emitting diode 8 attached to the intermediate ring 7 by a circuit described below to emit light.

A lighting circuit for 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 a modulator 14 and an oscillator 15 in this order via a microphone amplifier 13, and an output side of the oscillator 15 is connected to a drive circuit 17 of the light emitting diodes 8 and 11 via a buffer 16.

To the output side of the drive circuit 17, the cathodes of the four light emitting diodes 8 and 11 are connected. A set of these light emitting diodes 8 and 11 attached in the same direction is set, and a fixed contact of a pressure sensitive switch 9 is connected to each anode side. The movable contact of the pressure sensitive switch 9 is in contact with the light emitting diode 8 side when pressure is not sensed, and is in contact with the light emitting diode 11 side when pressure is sensed.

In this embodiment, four light emitting diodes 8 and 11 are provided, so that there are four pressure sensitive switches 9. Then, four pressure sensitive switches 9 are grouped in pairs, and two movable switches have two gravity switches 1
8 fixed contacts are connected. 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 1 via the power switch 4 (see FIG. 1).
9 is connected.

The one shown in FIGS. 3 and 4 is an example of the gravity switch 18. In these figures, 20 is a substrate. On one surface of the substrate 20, two arc-shaped electrodes 21 and 22 are provided so as to face each other. The electrodes 21 and 22 are obtained by plating a copper foil with nickel or the like to increase the surface strength (wear resistance). Lead wires 2 are provided at the ends of the electrodes 21 and 22.
3, 24 are connected.

A shaft 2 is provided in the central portion sandwiched by the electrodes 21 and 22.
5 is passed through, and a weight 26 is attached to the lower end of the shaft 25.
The upper end of the contact piece 27 to which is attached is pivotally attached. Due to this shaft attachment, the contact piece 27 is moved by the weight 26 when the microphone 1 is tilted, and always maintains a vertical posture. On the other hand, since the substrate 20 tilts together 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 so as to face each other, the contact piece 27 does not come into contact with either of the electrodes 21 and 22 when the main body 2 of the microphone 1 faces the vertical direction.

At least two gravity switches 18 having the above structure are provided inside the main body 2 of the microphone 1 so that the directions of the shafts 23 intersect. Each gravity switch 18 is preferably provided with a stopper having an appropriate structure so that the contact piece 27 does not rotate too much.

The above-described circuit of FIG. 2 is provided when two circuits are provided. When the structure shown in FIGS. 3 and 4 is adapted to the circuit of FIG. 2, the electrodes 21 and 22 serve as fixed contacts and the contact piece 27 serves as a movable contact.

This microphone 1 constructed in this way
Is used as follows. The power switch 4 is turned on, and the light emitting diodes 8 and 11 on the side where the movable contacts of the pressure sensitive switch 9 and the gravity switch 18 are in contact are placed in a standby state. When the diaphragm of the microphone unit 12 feels a voice in this state, a voice current is generated in the microphone unit 12 by its action. This 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 passed through the buffer 16 to the drive circuit 1 of the light emitting diode.
7 is supplied.

As described above, since the movable contact of the pressure sensitive switch 9 is in contact with the light emitting diode 8 side when pressure is not sensed, the light emitting diode 8 emits light unless the user grips the portion of the intermediate ring 7. The light emitting diode 11 emits light when grasped. Further, since this light emission is switched by the gravity switch 18 in accordance with the inclination of the microphone 1, the light emitting diode 8 (or the light emitting diode 11) facing upward of the main body 2 emits light.

FIG. 5 and FIG. 6 show another example of the gravity switch. The gravity switch 28 is formed by arranging a plurality of electrodes 30 radially inside a hermetically closed cylindrical hermetic container 29 at equal intervals and by inserting an appropriate amount of mercury 31 into the hermetic container 29. is there. The electrode 30 is
As shown in FIG. 6, a Y-shaped electrode 30a and a U-shaped electrode 30b
It is a combination that is placed at a distance so as not to touch. This electrode 30, which is located below during use of the microphone 1, is immersed in the mercury 31, and the Y-shaped electrode 30a and the U-shaped electrode 30b of the immersed electrode 30 are short-circuited by the mercury 31 and turned on. .

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 / off. Is to function as it does. Therefore, each electrode 30 of the gravity switch 28 is connected to the pressure sensitive switch 9
Will be connected in series. The other parts of the circuit are the same as those in FIG. 2, and therefore, the same reference numerals are given and the description thereof is omitted. In addition, in this figure, four electrodes 30 are shown.

In the case where the gravity switch 28 is used, one or several electrodes 30 can be short-circuited by appropriately determining the amount of mercury 31. In the structure shown in FIG. 6, six electrodes 30 are provided, and mercury 31 is used in an amount such that two of the electrodes 30 are short-circuited. In this case, since the microphone 1 is tilted, the mercury 31
The light-emitting diode 8 (11) facing the light-receiving element at the angle of the microphone 1 with the electrode 30 immersed therein and short-circuited
Connect to.

When using the microphone 1 by hand,
Especially when used in karaoke, the microphone 1 is often tilted in accordance with the rhythm. In this case, the action of the gravity switches 18 and 28 always causes some of the light emitting diodes 8 and 11 to emit light, so that signal transmission to the light receiving element is reliably performed.

[0045]

Since the present invention is the wireless microphone configured as described above, the signal transmission to the light receiving element is surely performed by the plurality of light emitting diodes provided at intervals. The light emitting diodes are arranged at the windscreen and the lower end of the microphone body, and the gravity switch is used to emit light, so it is not necessary to emit light from the light emitting diodes in the area where infrared rays do not reach the light receiving element. Therefore, it is possible to prevent wasteful 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 emits light only when the user grips the microphone head, so the light emitting diode provided on the microphone head is always efficient. The signal can be transmitted.

[Brief description of drawings]

FIG. 1 is a front view of a wireless microphone to which the present invention has been applied.

FIG. 2 is a circuit diagram showing a lighting circuit of the light emitting diode shown in FIG.

FIG. 3 is a front view showing an example of a gravity switch.

FIG. 4 is a side view of that of FIG.

FIG. 5 is a cross-sectional view showing another example of the gravity switch.

FIG. 6 is a front view showing an electrode structure of that of FIG.

FIG. 7 is a circuit diagram showing a circuit using the gravity switch shown in FIGS. 5 and 6.

[Explanation of symbols]

 1 Microphone 2 Body 3 Microphone 6 Windscreen 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 Shaft 26 Weight 27 Contact piece 28 Gravity switch 29 Closed container 30 Electrode 31 Mercury

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area H04R 1/04 Z

Claims (10)

[Claims] 1. A wireless microphone comprising a light emitting diode for optical communication, wherein the light emission of the light emitting diode is modulated by an audio signal, wherein a plurality of light emitting diodes are attached to a microphone at intervals. A wireless microphone that does. 2. The wireless microphone according to claim 1, wherein a plurality of light emitting diodes provided at intervals are attached to a windscreen portion. 3. The wireless microphone according to claim 1, wherein a plurality of light emitting diodes provided at intervals are attached to a lower end portion of the microphone body. 4. The wireless microphone according to claim 1, wherein a plurality of light emitting diodes provided at intervals are attached to both a windscreen portion and a lower end portion of the microphone body. 5. A pressure sensitive switch is provided in the windscreen portion to sense the pressure when the portion is gripped to switch the circuit, and the windscreen portion is gripped by the detection of the pressure sensitive switch. The wireless microphone according to claim 4, wherein the light emitting diode at the lower end of the microphone body emits light. 6. The wireless microphone according to claim 1, wherein among the plurality of light emitting diodes, only a specific one related to the inclination of the microphone body is switched to emit light. 7. The wireless microphone according to claim 6, wherein a switch mechanism for gravity use is housed inside the microphone body, and a specific light emitting diode is caused to emit light by the switch mechanism for gravity use. 8. A switch mechanism utilizing gravity is formed by an electrode attached to an insulator in an arc shape and a contact piece that changes a contact position with the electrode according to an inclination of a microphone body. Item 7. The wireless microphone according to item 7. 9. A switch mechanism utilizing gravity is formed by arranging a plurality of electrodes in a radial shape in a closed container and inserting a proper amount of mercury in the closed container. The described wireless microphone. 10. The wireless microphone according to claim 8, wherein a weight is attached to the lower end of the contact piece that changes the contact position with the electrode according to the inclination of the microphone body.