JP3178019B2 - microphone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microphone which transmits an input audio signal by infrared rays.

[0002]

2. Description of the Related Art At present, microphones (so-called vocal microphones, hand microphones) are widely used in performances, lectures, conferences, karaokes, and the like, and their use is becoming popular. In some cases, a code for transmitting an input audio signal to an amplifier, a mixer, or the like may limit the operation range of a user or may cause inconvenience such as entanglement of the code.
Wireless microphones using M radio waves are provided.

[0003]

However, a microphone that is made wireless by using radio waves can output only weak radio waves due to regulation by the Radio Law, so that the practicable range is considerably limited. Also,
A receiving device for receiving the FM radio wave transmitted from the microphone is required. However, since the transmitting radio wave is weak, the receiving device must have high reception sensitivity. For this reason, there is a problem that the device becomes considerably expensive, and is therefore difficult to spread to general users.

Further, in order to transmit an audio signal by radio waves,
For example, audio content is transmitted to the outside of a room using a microphone. For this reason, for example, it is unsuitable for use in meetings where privacy is required,
The range of use will be further limited.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a modulating means for performing a predetermined modulating process on an input audio signal, and a modulating signal obtained by the modulating means. A microphone provided with infrared transmitting means for transmitting and outputting as a signal is provided.In such a microphone, a surface capable of always maintaining a specific angle state in a horizontal direction is formed in the infrared transmitting means, The infrared signal is emitted to the outside through this surface.

[0006]

By using infrared rays as a cordless microphone system, transmission and reception means can be realized at low cost, and confidentiality can be maintained.

In the infrared transmitting means provided in such a microphone and outputting infrared rays obtained by, for example, a light emitting diode to the outside, a surface capable of always maintaining a specific angle state in the horizontal direction is formed. An infrared signal from a light emitting diode or the like is reflected on this surface and radiated to the outside, or the infrared signal is radiated to the outside with the light emitting diode or the like mounted on the surface to irradiate the infrared signal. The direction can always be within a certain angular range.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a microphone according to the present invention will be described below with reference to FIGS. FIG. 1 is an external view showing an embodiment of a microphone, FIG. 2 is a schematic structural diagram of the microphone 1, and FIG. 3 is a block diagram of a circuit configuration of the microphone 1.

As shown in FIG. 1, the microphone 1 includes a sound collecting unit 2, a main body 3, and an infrared transmitting unit 4. The sound collecting unit 2 has a cushion belt 5 in a circular shape.
Is attached, and a rubber ring 6 is provided around the joint between the main body 3 and the infrared transmitting section 4 in a circular shape. Reference numeral 5a denotes a required number of protrusions formed on the peripheral surface of the cushion belt 5. Reference numeral 7 denotes an operation switch for turning on / off the microphone 1.

The internal structure of the microphone 1 is configured as shown in FIG. That is, a sound collecting mechanism 2a formed by using a diaphragm, a boil coil, a magnet, or the like is disposed inside the sound collecting unit 2, and outputs a picked-up sound as an electric signal. A substrate 3a on which various circuit elements (not shown) are mounted is housed in the main body 3, and a battery housing 3b for housing a battery (dry battery) BT is formed. Reference numerals 3c and 3d denote electrode plates in the battery housing 3b.

The infrared transmitting section 4 formed at the lower portion of the main body 3 has a cover 4a, which is an outer housing thereof, formed of a material that can transmit at least infrared rays in a vertically long dome shape. Are provided with, for example, three LED light emitting elements 4b that output infrared signals. 4c is L
5 shows a substrate on which the ED light emitting element 4b and a predetermined circuit element are mounted. The substrate 4b is sandwiched and held by a damper 4d formed of, for example, an elastomer having elasticity, and a pressing ring 4e formed of an ABS resin to be colorless and transparent.

The material of the cover 4a is, for example, S-alloy (trade name) in which acrylic and polycarbonate are mixed.
Or polycarbonate is suitable. However, S-alloy has excellent infrared transmittance and also has a filter effect of cutting visible light, but is relatively brittle in terms of strength. On the other hand, polycarbonate does not have much filter effect of cutting visible light, but has excellent infrared transmittance and strength.

When employed as the cover 4a of the infrared transmitter 4 in the microphone 1, it is necessary to satisfy a certain degree of drop strength, and since it is not a light receiving means, a filter function for cutting visible light is necessarily required. is not. For this reason, it is preferable to use polycarbonate, and in this embodiment, it is formed with polycarbonate to a thickness of about 2 mm.

A gyro-mirror mechanism 8 is provided in the infrared transmitting section 4 for reflecting infrared rays from the LED light emitting element 4b attached downward in a predetermined direction. The gyro mirror mechanism 8 includes a support ring 8a
And the horizontal body 8b, the operation of which will be described later in detail. In addition, such a microphone 1
A predetermined portion of each mechanism in the inside is fixed by being joined by a screw B.

FIG. 3 shows a circuit block constructed in the microphone 1 having such a structure. That is, when the sound is converted into an electric signal (sound signal) by the sound pickup mechanism 2 a in the sound pickup unit 2, the electric signal is converted to the main body 3.
Is supplied to each circuit portion formed on the substrate 3a housed in the first stage.

First, an audio signal from the sound pickup mechanism 2a is supplied to a Dolby encoder 11, which is a C-type Dolby encoder. In the C type Dolby system, as shown in FIG. 4, compression and expansion of a high-frequency audio signal of about 20 dB are performed. Such a C-type Dolby system is described in, for example, Japanese Patent Application Laid-Open No. 57-41015. The Dolby encoder 11 is provided with a switch 11a, and the switch 11a sets ON / OFF of Dolby.

The output of the Dolby encoder 11 is ALC
(Auto level control) and the pre-emphasis circuit 12. The ALC and pre-emphasis circuit 12 sets the gain so that the signal level becomes a predetermined value and performs pre-emphasis.

This ALC and pre-emphasis circuit 12
Is configured based on the operational amplifier 12b. That is, between the output terminal and the inverting input terminal of the operational amplifier 12b,
The feedback resistor R ₁ is connected, and the operational amplifier 1
Inverting input of 2b is connected through a resistor R ₂ to the one end of the resistor R ₃ and capacitor C _1, further resistor R ₃ and the other end of the capacitor C ₁ is grounded through the capacitor C _2. The resistor R ₃ and the capacitors C ₁ and C _{2 form a} pre-emphasis circuit.

Further, the output of the operational amplifier 12b is supplied to the diode D ₁ via an amplifier 12c, the signal level of the output of the operational amplifier 12b in the diode D ₁ is detected. The detection signal level is synthesized and DC by the capacitor C ₃ and resistor R _4. Then, the resistance value of the variable resistor VR is controlled in accordance with the signal level, whereby the output signal level of the operational amplifier 12b is kept constant.
LC control will be achieved.

ALC and pre-emphasis circuit 1
ALC in parallel with capacitor C ₃ and resistor R ₄
A switch 12a for switching ON / OFF of the
When the switch 12a is turned on, the detection signal is grounded, and the ALC operation is not performed.

The switch 12a for setting ON / OFF of the ALC operation is interlocked with the switch 11a for setting ON / OFF of Dolby.
When Dolby is turned off by the switch 11a, the switch 12a is turned off, that is, ALC control is executed. When Dolby is turned on by the switch 11a, the switch 12a is also turned on, that is, the ALC control is stopped.

As described above, the switches 11a and 12a are interlocked with each other, so that the audio signal level is kept substantially constant by ALC control at the time of Dolby off, thereby preventing overmodulation. Also, ALC at Dolby On
Since the operation is not performed, the compression of the Dolby C method can be performed faithfully.

The output of the ALC and pre-emphasis circuit 12 is supplied to an oscillation and FM modulation circuit 13. The FM modulation circuit 13 has a subcarrier (eg, 2.3 MHz or 2.8 MHz).
z) is oscillated, and the subcarrier is FM-modulated with the supplied audio signal. Then, the FM-modulated audio signal is supplied to the LED drive circuit 14, that is, this LE
By the D drive circuit 14, the LED light emitting element 4b arranged in the infrared transmitting unit 4 is driven to emit light such that the luminance is modulated based on the FM-modulated audio signal.

With the above-described circuit configuration, the microphone 1 of the present embodiment converts the sound signal picked up by the sound pickup unit 2 into an infrared light signal as an infrared signal.
b.

Next, a microphone system using such a microphone 1 will be described. FIG. 5 is a configuration diagram of a microphone system including the microphone 1 and the reception device 30, and FIG. 6 is a configuration block diagram of the reception device 30.

The receiving device 30 includes an infrared receiving section 30a.
And the demodulation unit 30b are formed separately. The infrared light receiving unit 30a has a built-in photodiode, for example, for receiving an infrared signal output from the microphone 1 and converting the infrared signal into an electric signal. The infrared light receiving section 30a is formed in a small size so that it can be attached to, for example, a wall or ceiling in a room or installed at a predetermined position.

The signal received by the infrared receiving section 30a and converted into an electric signal is supplied to the demodulating section 30b via the cable 31. The demodulation unit 30b is configured as shown in FIG. 6, and a signal from a photodiode in the infrared light receiving unit 30a is first supplied to the front end circuit 32. In the front end circuit 32, a subcarrier frequency is selected, and this signal is converted into a predetermined intermediate frequency signal in the intermediate frequency amplifier 33.

The signal converted to the intermediate frequency is supplied to the FM demodulation circuit 34, and the audio signal is demodulated.
Further, the demodulated signal is supplied to a Dolby decoder 36 via a de-emphasis circuit 35, that is, a C-type Dolby decoder 36 having characteristics opposite to those of the Dolby encoder 11 in the microphone 1. Therefore, the audio signal compressed and transmitted by the Dolby encoder 11 is expanded to the original state. The Dolby decoder 36 is provided with a switch 36a for turning on / off the Dolby, which can be switched in accordance with the on / off of the Dolby in the microphone 1.

The audio signal output from the Dolby decoder 36 is level-adjusted in the amplifier circuit 37 and guided to the audio signal output terminal 38. As shown in FIG. 5, various devices can be connected to the audio signal output terminal 38 of the demodulation unit 30b. For example, a signal output from the audio signal output terminal 38 is, for example, a connected AV amplifier device. 4
By being supplied to the speaker 41 via the “0”, it is output as sound. When the headphones 42 are connected to the AV amplifier device 40 , the sound is output from the speakers of the headphones 42. Further, the sound can be supplied to a speaker, a sound recording device, or the like via the mixer 43 or directly to perform sound output or recording.

In the above-described microphone system, the sound picked up by the microphone 1 is converted into an infrared signal and output from the microphone 1, and the infrared signal is further received and demodulated by the receiving device 30. The audio signal obtained by 30 can be subjected to desired processing such as audio output and recording according to the connected device.

That is, a cordless microphone using infrared rays can be realized, and the usability of the microphone is improved. Further, since it is not necessary to make the infrared output weak, it is not necessary to set the receiving sensitivity of the receiving device 30 particularly high. Therefore, there is an advantage that a cordless microphone system can be realized at low cost. Furthermore, since infrared rays are used, no signal is transmitted outside the room or outside a space partitioned by a wall or the like, so that there is an advantage that confidentiality is maintained.

If the carrier frequency can be switched for each microphone, a plurality of microphones 1 can be used, for example, in the same room, and sound can be output through a specific receiving device 30, respectively. The transmission signal does not cause interference.

Also, the directivity of the infrared output from the infrared transmitter 4 is set for each microphone without changing the carrier frequency, or the directivity is variable in each microphone. By
For example, the same room can be divided into specific spaces and a plurality of microphone systems can be used simultaneously.

In FIG. 5, the receiving device 30 is composed of the infrared receiving unit 30a and the demodulating unit 30b. For example, as shown in FIG. FIG.
Demodulation circuit configuration (front end 32 to amplifying circuit 3)
7), a receiving device that outputs the obtained audio signal as it is to the speaker may be configured. In this case, the simplest cordless microphone system can be constructed only by the microphone 1 and the speaker device 44, and its usability, versatility, and convenience are further improved.

Further, as shown in FIG.
A receiving device is configured such that an infrared light receiving section 45a is integrally provided in the apparatus and a demodulation circuit configuration (front end 32 to amplifying circuit 37) is built in, and an audio signal from the microphone 1 is transmitted only to a wearer of the headphones 45. It is also conceivable to do so.

In the microphone 1 shown in FIG. 1, the infrared transmitting section 4 is provided at the lower end of the main body 3. The position of the infrared transmitting unit in the microphone employed as the cordless microphone system is not necessarily limited to the lower end of the microphone main body, but may be, for example, the central portion of the main body 3 or the sound collecting unit 2.
May be formed in the vicinity of the cushion belt 5 or the like.

However, the microphone 1 of the present embodiment
In particular, by setting the position of the infrared transmission unit 4 at the lower end of the microphone body, the following advantages are generated.

First, the lower end portion of the microphone main body is the portion that is least likely to be covered by the hand when the user carries the microphone 1. If the infrared transmitting unit 4 is covered with a hand, the infrared transmitting unit 4 cannot transmit an infrared signal to the receiving device 30 and thus does not become a possessor.
It is optimal to form the infrared transmitting section 4 at the lower end of the main body having the highest probability .

The lower end of the microphone main body is a part which is located farthest from the user's body when the user carries the microphone 1 or mounts it on a microphone holder or a microphone stand. In other words, the infrared transmission is the most suitable position for the infrared cordless microphone system in practical use of the infrared cordless microphone system because the infrared transmission is least interrupted by the shadow of the user's body or the like. For the above reasons, providing the infrared transmitter 4 at the lower end of the main body 3 has the advantage that the best transmission state can be maintained.

As described above, in the microphone 1 of the present embodiment in which the infrared transmitting section 4 is provided at the lower end of the main body, the cushion belt 5 is provided around the sound collecting section 2 as described above. A rubber ring 6 is provided between the parts 4.

The cushion belt 5 has a function of reducing shock noise generated when an impact is applied to the sound pickup section 2 and the like, and a required number of protrusions 5a are formed around the cushion belt 5, It also has a function of preventing the microphone 1 from rolling when placed on a desk or the like.

On the other hand, the rubber ring 6 is
In addition to having a rolling prevention function, the infrared transmission section 4 has a protection function and a gripping position stopper function for the user.

First, as can be seen from FIG. 9 in which the lower end portion of the microphone 1 is enlarged, the peripheral surface of the rubber ring 6 is polygonal, for example, octagonal, so that the microphone 1 is placed on a desk or the like. An anti-rolling function can be obtained. In order to obtain the function of preventing rolling, the peripheral surface may have a polygonal shape of a triangle or more. However, when a sufficient anti-rolling effect can be obtained with only the cushion belt 5, the rubber ring 6 may not necessarily have the anti-rolling function, but may be formed, for example, to have a circular outer periphery.

Next, the function of protecting the infrared transmitting section 4 by the rubber ring 6 formed as a convex body protruding from the peripheral surface of the main body section 3 will be described. The cover 4a of the infrared transmitting unit 4 has a glossy appearance and a smooth shape such as a flat shape or a spherical shape in order to protect internal elements and efficiently transmit light. If the cover 4a of the infrared transmitting unit 4 is scratched or stained, the light is irregularly reflected or the transmission amount is reduced, and the light transmission efficiency is significantly reduced.

Therefore, in order to prevent the cover 4a from being scratched or stained, when the microphone 1 is placed on a desk T as shown in FIG. 10, the rubber ring 6 is provided with a space so that the cover 4a is not grounded. It will work as a spacer for obtaining S. Since the cover 4a is not grounded on a desk or the like, the generation of scratches, dirt, and the like can be considerably prevented, and therefore, a favorable infrared signal transmission operation can be maintained.

Further, the rubber ring 6 has a function of stopping the gripping position by the rubber ring 6 being present between the infrared transmitting unit 4 and the main body 3 to urge the user to hold the main body 3. It is. In other words, it is possible to prevent the infrared transmitting unit 4 from being covered with the hand and the transmission of the infrared signal to the receiving device 30 to be disabled.

Incidentally, even when the infrared transmitting unit 4 is not provided at the lower end of the microphone body, the infrared transmitting unit 4
By providing such rubber ring 6 in the vicinity of 4, it is possible to realize the protection function and the stopper function of the infrared-ray transmitter 4. In addition, in order to realize the protection function and the stopper function of the infrared transmitting unit, the peripheral shape of the rubber ring 6 does not need to be polygonal. Of course, it is not necessary to form with an elastic body such as rubber.

Further, in this embodiment, the protection function of the infrared transmitter 4 and the stopper function of the gripping position are obtained by the rubber ring 6, but the means provided in a ring shape like the rubber ring 6 may be used. However, the same protective effect and stopper effect of the gripping position can be obtained by using, for example, a required number and a predetermined number of protrusions provided in the vicinity of the infrared transmitter 4.

By the way, in the microphone 1 of this embodiment, as shown in FIG. 2, the LED light emitting element 4b is arranged downward, and the infrared output from the LED light emitting element 4b is
Gyro mirror mechanism 8 that reflects infrared light in a predetermined direction
To be sent via the Internet.

As an internal mechanism of the infrared transmitter 4, the gyro-mirror mechanism 8 is not used and infrared light can be transmitted by merely arranging the LED light emitting element 4b.
It is preferable to dispose the ED light emitting element 4b and employ a gyro mirror mechanism 8, that is, a mechanism in which a mirror surface serving as a reference in the infrared output direction is always kept at a specific angle in the horizontal direction, and various advantages are obtained. Hereinafter, these advantages will be described together with the gyro mirror mechanism 8. FIG. 11 is an exploded perspective view showing an internal mechanism of the infrared transmitter 4.
FIG. 12 is a sectional view showing the assembled state.

The state LED light emitting element 4b (not shown) the substrate 4c mounted downward is stacked so as to avoid the protrusion 4e ₁ of the upper surface of the peripheral surface protrusion 4c ₁ the pressing ring 4e, that is, a state where the upper plane of the protrusion 4e ₁ and the substrate 4c are substantially the same plane, the substrate 4c and the presser ring 4e are inserted from below into a damper 4d, as shown in FIG. 12, the substrate 4c is a damper 4d Presser ring 4e
Is held between the two.

At this time, the concave portion 4d below the damper 4d
₁ and the pressing protrusion 4e ₂ of the peripheral surface lower portion of the ring 4e is fitted. That is, by this fitting, the damper 4d and the holding ring 4
circumferential positioning of e is made in three directions screw holes 4e ₃ provided in three directions (120 ° intervals) in the screw hole 4d ₂ and the holding ring 4e provided (120 ° intervals) in the damper 4d match Is done.

The screw holes 4d _{2 of the} damper 4d and the screw holes 4e ₃ of the holding ring 4e are also aligned with the screw holes 4a ₁ provided in three directions (120 ° intervals) in the cover 4a of the infrared transmitting unit 4. , Each screw hole 4a ₁ , 4e
_3, the 4d ₂ by screws B is screwed is inserted, the damper 4d and the presser ring 4e will be fixed in the cover 4a while holding the substrate 4c.

The support ring 8a is disposed below the press ring 4e. The support ring 8a is made of, for example, ABS.
It is a colorless and transparent body made of resin, and the ring portion 8a ₁
When it is formed from a horizontal member supporting portion 8a ₂ of the shaped U-shaped, which is provided below the ring portion 8a _1. The upper surface of the ring portion 8a ₁ is formed slide projection 8a _3, it is circumferentially on the sliding protrusions 8a ₄ is formed on the further circumferential surface. The horizontal member supporting portion 8a ₂ is formed a shaft hole 8a ₅ for supporting the horizontal member 8b, the still bottom of the U-shaped horizontal member support portion 8a ₂ is axially projection 8a ₆ is formed I have.

[0055] The support ring 8a is in contact with the bottom surface of the pressing ring 4e in sliding protrusion 8a ₃ As can be seen from FIG. 12, also contacts the inner peripheral surface of the cover 4a and the sliding protrusions 8a _4, further axial projections 8a not fixed only by contacting loosely fitted and a shaft recess 4a ₂ provided on the inner surface at the bottom of the cover 4a at _6. Therefore, the direction of rotation with respect to the center axis of the main body of the microphone 1 (arrow K _{1 in} FIG. 11)
Direction).

[0056] Horizontal member 8b is pivotally supported by a horizontal member supporting portion 8a ₂ of the support ring 8a. That is, the axial projections 8b ₁ is formed to be inserted into the shaft hole 8a _5, whereby the horizontal member 8b rotates in the direction of rotation with respect to the central axis of the shaft projections 8b ₁ (arrow K ₂ direction in FIG. 11) It is free. The main body portion 8b ₂ of the horizontal member 8b are formed in a hemispherical shape, the upper flat surface is a mirror portion 8b _3. Further the bottom of the hemispherical body portion 8b ₂ is formed by a weight 8b _4.

The infrared transmitting unit 4 configured as described above
Then, the gyro mirror mechanism 8 including the support ring 8a and the horizontal body 8b causes the LED mounted on the substrate 4c to be mounted.
The light output from the light emitting element 4b can always be emitted within a predetermined direction range. This support ring 8a is rotatable in the arrow K ₁ direction and has a horizontal member 8b is rotatable in the arrow K ₂ direction, moreover in weight 8b ₄ is attached to a lower portion of the horizontal member 8b by there, even if the microphone 1 is attached at any angle state holding or microphone stand or the like to the user by the K ₁ direction and K ₂ directions, the upper surface or mirror portion 8b of the horizontal member 8b regardless of its angle ₃ is to be kept horizontal.

For example, when the microphone 1 is in a vertical state as shown in FIG.
₃ is maintained at a right angle to the microphone 1 body. At this time, for example, the light output from the LED light emitting element 4b attached at an angle of about 10 ° below the substrate 4c is reflected by the mirror section 8b ₃ at a predetermined reflection angle. To the infrared transmitter 4
Through the cover 4a.

[0059] From this state, be inclined 45 ° to the microphone 1 toward any direction, the support ring 8a by the action of the weight 8b ₄ is rotated by a predetermined angle in the K ₁ direction, and the horizontal member 8b in the K ₂ directions As shown in FIG.
(B) mirror 8b ₃ as is kept horizontal. The light output from the LED light emitting element 4b may is reflected by the mirror portion 8b ₃ at a predetermined reflection angle, it is emitted to the outside through the cover 4a of the infrared-ray transmitter 4.

[0060] Further, even tilt the microphone 1 90 ° towards any direction, likewise the support ring 8a and the horizontal member 8b by the action of the weight 8b ₄ is rotated by a predetermined angle, respectively, as shown in FIG. 13 (c) mirror 8b ₃ is kept horizontal. In this case, light output from the LED light emitting element 4b is reflected by the mirror portion 8b ₃ at a predetermined reflection angle, or directly, and is emitted to the outside from the infrared-ray transmitter 4 through the cover 4a.

[0061] By mirror portion 8b ₃ thus always horizontally maintained, for example, using the microphone 1 in the room R as shown in FIG. 14, the infrared signal from the infrared transmitting unit 4 is always the hatched portion C It is output in the area (that is, in the range of 0 to 90 degrees in the vertical direction in front of the user M).

In the case of FIG. 13 (a), the data is output in a range other than 0 to 90 ° in the vertical direction.
Since the microphone 1 is not used in a completely vertical state, it does not need to be considered strictly. Even if used in a vertical state, there is no problem because the output is also made in the range of 0 to 90 degrees in the vertical direction.

An advantage generated by the microphone 1 of the present embodiment outputting infrared light in the range of 0 to 90 ° in the vertical direction in the front will be described. In the room R, objects that become infrared obstacles such as desks, chairs, and furniture usually exist within a range of about 1 to 1.5 m (area D) near the floor. Therefore, even if infrared light is output from the microphone 1 toward the region D, the transmission efficiency is significantly reduced. In addition, behind the user M (areas A and B), the user M itself becomes an obstacle, so that it is almost useless to output infrared rays toward the areas A and B.

In other words, in the areas A, B, and D, even if the receiving device 30 is installed, it is difficult to perform good infrared transmission. Conversely, it is most efficient to perform transmission only in the area C. Further, in order to widen the directivity so that infrared rays are also output in the directions of the areas A, B, and D, several LED light emitting elements having a wide directivity may be used with a strong output, or may be narrow. It is necessary to use many LED light emitting elements with directivity,
Various adverse effects, such as an increase in the size of the infrared transmission unit, an increase in cost, and an increase in current consumption, occur.

In this embodiment, the gyro-mirror mechanism 8 enables the infrared output to be always performed only in the range of 0 to 90 ° in the forward and downward directions where infrared transmission is most effective. The light-emitting means is constituted only by three LED light-emitting elements having a characteristic, thereby realizing low cost, low current consumption, and miniaturization of the light-emitting means.

Further, by providing the gyro mirror mechanism 8, the LED light emitting element 4b can be mounted downward from the substrate 4c. That is, the infrared light output direction of the LED light emitting element 4b may be left below the microphone 1 and does not need to be directed horizontally or upward. Therefore, the board 4c can be provided close to the main body 3, and the board design and assembly can be performed. There is also an advantage that the setting of the method is very easy.

The shapes of the support ring 8a and the horizontal body 8b constituting the gyro-mirror mechanism 8, the rotatable support system, and the like are not limited to those in the above-described embodiment, but are mechanisms that always keep the horizontal body 8b horizontal. Any form may be used as long as it is provided.
That is, have not a group in the action of the weight disposed under the mirror unit may be a mechanism that is rotated in the K ₁ direction and K ₂ directions.

[0068] As in FIG. 15 for example, provided with a circumferential groove 4a ₃ on the inner peripheral surface of the cover 4a, the support ring 8
a it may also be constructed by forming only the ring portion 8a ₁ which is rotatably loosely supported in K ₁ direction with respect to the groove 4a _3, the gyro mirror unit 8 having the same function. In this case, the axial projections 8b ₁ of the K ₂ direction of the axis of rotation of the horizontal member 8b is to be supported by the shaft hole 8a ₅ of the inner peripheral surface provided with eg a non-through of the support ring 8a.

Even without using such a two-axis gyro mechanism, for example, as shown in FIG. 16, a closed space 4g is formed by a transparent body 4f in a cover 4a, and a liquid W is filled in the closed space 4g. If the mirror 4h is floated on the water surface of the liquid W while enclosing the liquid W, the mirror 4h can always obtain a reflecting surface in a horizontal state. In addition,
If the liquid to be sealed is a liquid metal such as mercury, the liquid surface itself becomes a reflection surface, so that the mirror 4h can be dispensed with.

[0070] Incidentally, in the gyro mirror unit 8 of the two axes as described above, the mirror portion 8b ₃ is not limited to those formed in the horizontal state to the upper surface of the horizontal member 8b, setting conditions of application and the microphone system (e.g., receiver depending on the position) of the apparatus 30 may be formed mirror portion 8b ₃ having a predetermined angle with respect to the horizontal direction on the upper surface of the horizontal member 8b. As a result, the output angle range of the infrared signal is set to 0 in the vertical direction.
It can be shifted upward or downward from a range of up to 90 °.

Further, the upper surface of the horizontal body 8b is
₃ (gyro-mirror mechanism 8), but it is also conceivable to arrange a substrate on which the LED light-emitting element is mounted at a predetermined upward angle on the upper surface of the horizontal body 8b without using a mirror. Even with this configuration, it is possible to always output an infrared ray in a range of approximately 0 to 90 degrees in the front and vertical direction.

As described above, the microphone 1 of the present embodiment
Then, in the infrared transmitting unit 4, the upper surface of the horizontal body (= mirror unit) serving as the infrared reflecting surface or the upper surface of the horizontal body serving as the mounting surface of the LED light emitting element is always kept at a specific angle in the horizontal direction. By dropping, it is possible to always output an infrared signal within a specific angle range.

In the infrared transmitting section 4 having the gyro mirror mechanism 8 described above, the
Although the infrared output range is set to 90 °, it is preferable to further fix the infrared output angle range depending on system conditions, for example, when the position of the receiving device 30 is fixed. That is, even if a low-output LED element is used in the infrared transmitter 4 by concentrating the infrared output, efficient light reception can be realized in the receiver 30 and the directivity of the light receiver of the receiver 30 is narrow. In addition, the number and range of the receivers 30 to be installed can be limited, so that a low-cost and high-performance infrared cordless microphone system can be realized.

FIG. 17 is an exploded perspective view showing the internal mechanism of the infrared transmitting unit 4 having the mirror mechanism 9. This mirror mechanism 9 always outputs infrared rays in a fixed angle direction. depending on the rotation of the body in the circumferential direction microphone 1 (K ₁ direction), perpendicular to the first rotation mechanism that is rotatable in the K ₁ direction, and the circumferential direction of the rotation of the main body microphone 1 in response to the rotation direction (K ₂ direction), K ₂ directions and a second rotation mechanism that is only rotated 1/2 of the angle of the rotation angle of the microphone 1, and further equipped with a mirror It is composed of FIG. 18 is a sectional view showing the assembled state. Note that FIG.
1 and FIG. 12 are denoted by the same reference numerals, and description thereof is omitted. The LED element 4b is not shown.

In the infrared transmitting section 4, the LED element 4b
The substrate 4c on which is disposed the damper 4d and the holding ring 4e.
And the cover 4 of the infrared transmitter 4
The provided groove 4a ₃ circumferentially of the inner peripheral surface of a, a configuration for holding the mirror mechanism 9 by the groove 4a _3.

That is, in the mirror mechanism 9, the sliding ring 9a has the groove 4
a ₃ is held so as to be rotatable in the K ₁ direction by loosely fitted to, the inner peripheral surface side of the slide ring 9a is mounted a pair of gear support plates 9b, the pair gear support On the plate 9b, three gears 9c, 9d, 9e are arranged in a meshing state. Further, the inside of the gear 9e is the upper surface is substantially hemispherical reflector 9f which is a mirror 9f ₁ is attached. Mirror 9f ₁ is formed on the inclined surface having an angle of 30 ° from the horizontal direction in the upper surface of the reflector 9f. A weight 9f ₂ is provided below the reflector 9f.
Is attached.

[0077] In the mirror mechanism 9, the gear 9c and the slide ring 9a is its axis 9c ₁ is mounted in a fixed state, hence the gear 9c does not rotate with respect to the sliding ring 9a. However, the gear support plate 9b disposed between the gear 9c and the slide ring 9a is pivotally supported by a shaft 9c _1, and is rotatable in the K ₂ direction relative to the sliding ring 9a.

The gears 9d and 9e are connected to the support plate 9 respectively.
b is supported by the shafts 9d ₁ and 9e ₁
It is rotatable with respect to the support plate 9b. Here, the gear 9c and the gear 9d have the same number of teeth, and the number of teeth of the gear 9e is set to twice the number of teeth of the gear 9c and the gear 9d. Further, the reflector 9f is fixed to the gear 9e.

[0079] describing the angular variation of the mirror portion 9f ₁ in such a mirror arrangement 9 in Figure 19. J in each figure
₁ shows a positional state of the slide ring 9a is perpendicular state central axis of the microphone 1 body, J ₂ is always J ₁ and.

[0080] As shown in FIG. 19 (a), the front mirror 9f ₁ is the right direction on the downslope of the state (the drawing angle of 30 ° from the horizontal state of the microphone 1 when the microphone 1 is in a vertical state have been and made), when tilting the microphone 1 body even towards any direction, for example 45 °, as shown in FIG. 19 (b), the by the action of the weight 9f _2, slide ring 9a first is in the groove 4a ₃ rotated by a predetermined angle, also the gear support plate 9b is 45 ° rotated with respect to the sliding ring 9a.

[0081] Here, the gear 9c is because it is fixed to the slide ring 9a, 45 ° rotatable gear 9d within R ₁ direction relative gear support plate 9b as well as gear 9c meshed
It will rotate. Furthermore gear 9e gear ratio is twice the rotation of 45 ° of the gear 9d is rotated 22.5 ° in the R ₂ direction. Therefore, the reflector 9f fixed to the gear 9e is also R ₂
It will be 22.5 ° rotation in the direction of the mirror portion 9f ₁ is the downslope state of 7.5 ° toward (the right direction in the drawing) horizontally from the microphone 1 forward.

Further, in any direction, as shown in FIG.
Tilting °, likewise by the action of the weight 9f _2, slide ring 9a is rotated by a predetermined angle first, and the gear support plate 9b is 90 ° rotated with respect to the sliding ring 9a. Therefore gear 9
d is rotated 90 ° in the R ₁ direction, whereby since the gear 9e is rotated 45 ° in R ₂ direction, the reflector 9f secured to the gear 9e is also decided to 45 ° rotated in the R ₂ direction. That is, the mirror portion 9f ₁ is in the state of the uplink slope 15 ° toward the horizontal direction in front of the microphone 1.

[0083] describing the infrared output direction due to variations in the inclination of the mirror portion 9f ₁ Thus in Figure 20. FIG.
FIG. 19A corresponds to the state of FIG. 19A, that is, the case where the microphone 1 is in the vertical state. Since the mirror 9f ₁ is a downslope condition of 30 ° this case, infrared rays outputted from the LED element 4b is reflected by the mirror portion 9f ₁ at an incident angle and reflection angle of 60 °. That is, 30 from the horizontal direction
The light is emitted obliquely upward and forward at an angle of °.

[0084] Further, since in the case shown in FIG. 20 (b) tilting the microphone 1 45 °, the mirror portion 9f ₁ is a state of the downslope of 7.5 ° from the horizontal direction as described above, LE
Infrared output from the D element 4b is reflected in the mirror 9f ₁ at an incident angle and reflection angle of 37.5 °, thus being irradiated obliquely upward at an angle of 30 ° from the horizontal direction.

[0085] Further, in the case of FIG. 20 by tilting the microphone 1 90 ° (c), since the mirror 9f ₁ is a state of the uplink slopes 15 ° from the horizontal direction, the infrared rays outputted from the LED element 4b 15 ° incidence angle and then reflected by the mirror portion 9f ₁ at a reflection angle, and therefore is irradiated obliquely upward at an angle of 30 ° from the horizontal direction.

[0086] That is, by the mirror mechanism 9, be held microphone 1 at any angle state K ₁ and K ₂ directions, infrared output from the LED element 4b is always irradiated forward 30 ° upward Will be. Since the infrared output angle direction is fixed in this manner, the number of installations and the installation range of the receiving device 30 can be considerably limited. Further, in such a system, it is not necessary to provide a wide directivity for the infrared output. Therefore, in the microphone 1, the number of LED elements and the driving current can be reduced, so that a low-cost and high-performance cordless microphone system is realized.

In the above example, the infrared irradiation direction was set at 30 ° in front of the microphone 1.
By changing the angle of forming the mirror 9f ₁ of f top it can be adjusted freely as desired. For example, reflector 9f
As the slope of the upper surface 45 °, if this mirror portion 9f _1, infrared irradiation direction is always forward 45 ° above the angular direction.

[0088] Note that, which is used the microphone 1 is, for example fixed to the microphone stand, if never body of the microphone 1 in use is rotated to the K ₁ direction, K ₂ directions of rotation The same effect can be obtained by providing only a mechanism that rotates by a half angle corresponding to.

The microphone 1 of the present embodiment is provided with the gyro mirror mechanism shown in FIG. 11 and the mirror mechanism shown in FIG. 17, and the infrared output from the LED element 4b is reflected to irradiate the outside of the microphone in a specific range direction or a specific angle direction. However, in actual use, it is sometimes desired to change the directivity itself of the infrared output. Therefore, it is conceivable to prepare various mirror mechanisms in which the surface serving as the mirror portion is concave, convex, flat, or the like, so that these can be replaced as needed.

For example, as shown in FIG.
A gyro mirror mechanism 8 having the same operation as that described above is formed in the cover 4a of the infrared transmitter 4. However, a groove 4a ₃ in circumferentially on the inner peripheral surface of the cover 4a, to be rotatably held by fitting the ring portion 8a ₁ of the support ring 8a in the groove 4a _3. That is, the gyro mirror mechanism 8 is held only by the cover 4a and does not fall off the cover 4a. Then, the upper inner peripheral surface of the cover 4a for forming the engaging groove 4a _4. Note that a rubber ring 6 is attached to the upper outer peripheral surface of the cover 4a.

[0091] Here, in the gyro mirror unit 8 in FIG. 21 (a), the mirror portion 8b _3, are formed on the upper surface of the horizontal member 8b, which is a flat, mirror portion 8b in FIG. 21 (b) ₃ is a convex surface, and FIG.
The mirror portion 8b ₃ is concave in (c).

On the other hand, the lower end of the main body 3 of the microphone 1 is mounted on a substrate 4 on which the LED elements 4b are arranged as shown in FIG.
c is fixed, and the infrared transmitting unit 4
Are engagement grooves 10 which engage with the engaging groove 4a ₄ provided in the cover 4a is formed to select the desired infrared-ray transmitter 4 of the example FIG. 21 (a) ~ (c) , rotating it and it is capable of mounting by going screwed engaging groove 4a ₄ and engagement grooves 10 while. For example showing a state of mounting the infrared-ray transmitter 4 of Figure 21 where the mirror portion 8b ₃ is a convex surface (b) in FIG. 23.

As shown in FIG. 24, when the mirror surface is convex, the reflected light reflected on the mirror surface is different from that in FIG. 24 (a) where the mirror surface is flat. Thus, reflected light having a wide directivity is obtained, while reflected light having a concave surface is converged as shown in FIG. 24C, that is, reflected light having a narrow directivity is obtained.

[0094] Therefore, the control by the surface shape of the mirror portion 8b ₃ as described above can be replaced with different infrared transmission section 4, the directivity of the infrared signal output from the microphone 1, the user as desired As a result, an optimal microphone system can be constructed according to the actual use situation.

Further, by adopting the method of changing the mirror surface shape as described above, for example, L having different directivities can be obtained.
There is also an advantage that a microphone capable of directivity control can be realized at low cost, compared to preparing various infrared transmitting units having ED elements and replacing them.
In this case, electrical connection between the main unit 3 and the infrared transmitting unit 4 is not required, so that designing and manufacturing are easy.

It should be noted that a variety of replaceable infrared transmitters 4 may be further prepared, and a mirror mechanism as shown in FIG. 17 may be employed for the replaceable infrared transmitter 4. In addition to the above-described method, the infrared transmitting unit 4 having the mirrors having various surface shapes may be attached to the main unit by using screws, or a locking piece may be provided on the infrared transmitting unit 4 and the main unit may be provided. Various methods such as a method in which a locked portion is provided and engaged with the vehicle are conceivable.

Further, the entire infrared transmitting section 4 is replaced. However, for example, the infrared transmitting section 4 may be removed so that only the mounted mirror section can be replaced with one of various surface shapes.

The gyro-mirror mechanism 8 and the mirror mechanism 9 can also be applied to the receiving device 30.
Thus, the light receiving direction can be set in a predetermined range. Also, in the receiving device 30, the light-collecting characteristics of the receiving device 30 can be controlled as desired by making it possible to replace a cover (light receiving unit housing) having a mirror having various surface shapes.

The shape, structure, and circuit configuration of the microphone of the present invention are not limited to the above embodiment, but can be variously changed within the scope of the gist of the present invention.

[0100]

As described above, the microphone of the present invention has an effect that an inexpensive cordless microphone system can be constructed by transmitting a voice signal by using infrared rays, and that secrecy can be maintained. In addition, a surface that always keeps a specific angle in the horizontal direction is formed in the infrared transmitting means, and the infrared signal is output through this surface, so that the infrared signal is always output within a specific angle range. Therefore, there is an advantage that a good infrared transmission operation can be realized, and the cost and size of the microphone and its system can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a microphone according to the present invention.

FIG. 2 is an explanatory diagram of an internal structure of the microphone according to the embodiment.

FIG. 3 is a circuit block diagram of the microphone of the embodiment.

FIG. 4 is an explanatory diagram of compression / expansion characteristics of a C type Dolby system.

FIG. 5 is a configuration diagram of a microphone system.

FIG. 6 is a circuit block diagram of a receiving device of the microphone system.

FIG. 7 is a perspective view of another receiving device of the microphone system.

FIG. 8 is a perspective view of still another receiving device of the microphone system.

FIG. 9 is a perspective view of a lower end portion of the microphone according to the embodiment.

FIG. 10 is an explanatory diagram of a function of a rubber ring of the microphone according to the embodiment.

FIG. 11 is an exploded perspective view of an infrared transmitter having a gyro mirror mechanism of the microphone of the embodiment.

FIG. 12 is a cross-sectional view of an infrared transmitter having a gyro mirror mechanism of the microphone of the embodiment.

FIG. 13 is an explanatory diagram of an operation of the gyro mirror mechanism of the embodiment.

FIG. 14 is an explanatory diagram of an irradiation area by the gyro mirror mechanism according to the embodiment.

FIG. 15 is an explanatory diagram of another gyro mirror mechanism of the embodiment.

FIG. 16 is an explanatory diagram of still another gyro mirror mechanism of the embodiment.

FIG. 17 is an exploded perspective view of an infrared transmitter having a mirror mechanism in the microphone of the embodiment.

FIG. 18 is a cross-sectional view of an infrared transmitter having a mirror mechanism in the microphone of the embodiment.

FIG. 19 is an explanatory diagram of the operation of the mirror mechanism according to the embodiment.

FIG. 20 is an explanatory diagram of an operation of the mirror mechanism according to the embodiment.

FIG. 21 is a cross-sectional view of a detachable infrared transmitter in the microphone of the embodiment.

FIG. 22 is a cross-sectional view of the lower end of the main body of the microphone according to the embodiment, in which the infrared transmitter is detachable.

FIG. 23 is a cross-sectional view of the lower end of the main body to which the detachable infrared transmitter of the microphone of the embodiment is attached.

FIG. 24 is an explanatory diagram of a reflection operation of a mirror surface.

[Explanation of symbols]

1 microphone 3 the body 4 infrared transmission section 4a cover 4a ₄ engaging groove 4b LED light emitting element 4c substrate 6 rubber ring 8 gyro mirror mechanism 8a support ring 8b horizontal member 8b ₃ mirror portion 8b _4, 9f ₂ weight 9 mirror mechanism 9a sliding Moving ring 9b Gear support plate 9c, 9d, 9e Gear 9f Reflector 10 Engagement groove 30, 44, 45 Receiver 30a, 44a, 45a Infrared light receiver 30b Demodulator

Claims (1)

(57) [Claims] A modulation means for performing a predetermined modulation process on an input audio signal, and an infrared transmission means for transmitting and outputting a modulation signal obtained by the modulation means as an infrared signal are provided. A microphone, wherein a surface capable of always maintaining a specific angle state in a horizontal direction is formed in the means, and an infrared signal is irradiated to the outside through this surface.