JP7118421B2 - Wireless microphones and wireless transmitters - Google Patents

Description

The present invention relates to wireless microphones and wireless transmitters.

2. Description of the Related Art In recent years, wireless microphones (hereinafter referred to as "microphones") that transmit audio signals to external devices such as amplifiers and mixers using infrared communication are mainly used indoors for karaoke, meetings, lectures, and the like. The microphone is held by the user of the microphone when in use.

In general, a microphone using infrared communication has an electroacoustic transducer that generates an audio signal corresponding to the sound picked up, and an infrared signal output from a light source (for example, an LED (Light Emitting Diode)). and a transmitter for transmitting the An infrared signal output from the transmitter is transmitted toward a light receiver arranged on a wall, ceiling, or the like. As a result, the audio signal from the microphone is transmitted to an external device such as a demodulator via the receiver.

When a person uses a microphone while holding it in his or her hand, the posture of the microphone is always displaced by the influence of the person's hand (rotation, tilt, etc. applied to the microphone by the person's hand). That is, the direction in which the infrared signal is output (orientation of the light source) is constantly displaced. Therefore, depending on the posture of the microphone, the light source may turn in a direction other than the light receiver, and the light receiver may not receive the infrared signal. As a result, infrared communication between the microphone and the receiver may be interrupted (unstable).

Techniques for stabilizing infrared communication between a microphone and a light receiver regardless of the orientation of the microphone (orientation of the light source) have been proposed (for example, see Patent Documents 1 and 2).

The microphone disclosed in Patent Document 1 has a plurality of LEDs (light sources) arranged in a ring shape, and by outputting infrared signals from all the LEDs without blind spots, regardless of the posture of the microphone (direction of the light source) Realize stable infrared communication. However, the microphone disclosed in Patent Document 1 outputs infrared signals from all LEDs. As a result, most of the output infrared signals are lost without being received by the light receiver, which is a factor in wasting the power of the microphone.

On the other hand, the microphone disclosed in Patent Document 2 has a mechanism combining a gyro mechanism and a mirror. The light is reflected (output) in the direction (the direction of the light receiver placed on the ceiling or wall). Therefore, the infrared signal output from the microphone disclosed in Patent Document 2 is efficiently transmitted toward the light receiver regardless of the posture of the microphone (orientation of the light source). However, the gyro mechanism is composed of multiple moving parts that must operate smoothly. Therefore, if the gyro mechanism is distorted due to impact such as dropping, the operation of the gyro mechanism may be hindered.

JP-A-9-51279 JP-A-5-49087

SUMMARY OF THE INVENTION An object of the present invention is to efficiently transmit an infrared signal to a light receiver regardless of the orientation of the microphone, that is, the orientation of the light source.

A wireless microphone according to the present invention includes an electroacoustic transducer that generates an audio signal based on a sound wave from a sound source, a light source that outputs light carrying the audio signal, a light guide section that guides the light from the light source, A detection unit that detects the displacement of the posture of the light guide unit, a control unit that outputs a control signal based on the detection result of the detection unit, and switches the traveling direction of the light guided by the light guide unit based on the control signal. a switching portion, wherein the light guide portion electrically switches between a reflective state of reflecting light from the light source in the first direction and a transmissive state of transmitting the light from the light source to guide the light. a first light guide section; and a terminal light guide section that guides light transmitted through the first light guide section in a second direction different from the first direction. It is characterized by switching between a reflective state and a transmissive state of the light section.

According to the present invention, infrared signals can be efficiently transmitted toward the light receiver regardless of the orientation of the microphone, that is, the direction of the light source.

1 is a front view showing an embodiment of a wireless microphone according to the present invention; FIG. 2 is a functional block diagram of the wireless microphone of FIG. 1; FIG. 2 is a partially enlarged perspective view of the wireless microphone of FIG. 1; FIG. FIG. 2 is a schematic diagram showing how a first light guide section included in the wireless microphone of FIG. 1 guides light; FIG. 2 is a schematic diagram showing how a first light guide section and a second light guide section included in the wireless microphone of FIG. 1 guide light; 2 is a schematic diagram showing how a first light guide section, a second light guide section, and a terminal light guide section provided in the wireless microphone of FIG. 1 guide light. FIG. FIG. 2 is a schematic diagram showing the relationship between directions in which light is guided by a first light guide section, a second light guide section, and a terminal light guide section with respect to an optical axis of light output from a light emitting section included in the wireless microphone of FIG. 1 ; FIG. 2 is a schematic diagram showing the relationship between a sensor section provided in the wireless microphone of FIG. 1, an optical axis, and directions in which light is guided by a first light guide section, a second light guide section, and a terminal light guide section. 2 is a flow chart showing the operation of the wireless microphone of FIG. 1; FIG. 2 is a schematic diagram showing an example of specifying a direction of a light receiver by a signal generator included in the wireless microphone of FIG. 1; FIG. 3 is a schematic diagram showing an example of switching the traveling direction of light guided by a light guide section provided in the wireless microphone of FIG. 1 ; The direction of gravity and the directions in which light is guided by the first light guide, the second light guide, and the terminal light guide when the head case of the wireless microphone in FIG. 1 is positioned above the light guide. , is a schematic diagram showing an example of an angle formed by . The direction of gravity in the state in which the head case in FIG. 12 is positioned below the light guide and the direction in which the light is guided by the first light guide, the second light guide, and the end light guide. FIG. 4 is a schematic diagram showing an example of angles; FIG. 3 is a functional block diagram showing another embodiment of a wireless microphone according to the present invention; FIG. 13 is a schematic diagram showing how a first light guide section and a terminal light guide section included in the wireless microphone of FIG. 12 guide light; FIG. 13 is a schematic diagram showing the relationship between the directions in which the light is guided by the first light guide section and the end light guide section with respect to the optical axis of the light output by the light emitting section provided in the wireless microphone of FIG. 12 ; 13 is a flow chart showing the operation of the wireless microphone of FIG. 12; FIG. 13 is a schematic diagram showing an example of specifying the light receiver direction by the signal generator provided in the wireless microphone of FIG. 12; 13A and 13B are schematic diagrams showing an example of switching the traveling direction of light guided by a light guide section provided in the wireless microphone of FIG. 12; FIG. 5 is a schematic diagram showing still another embodiment of the wireless microphone according to the present invention;

Hereinafter, embodiments of a wireless microphone (hereinafter referred to as "microphone") and a wireless transmitter (hereinafter referred to as "transmitter") according to the present invention will be described with reference to the drawings.

The present invention changes the direction of the infrared signal output from the microphone according to the change in the posture of the microphone that occurs when a person holds the microphone (transmitter) in his/her hand and uses it, thereby changing the posture of the microphone. Regardless, it efficiently transmits the infrared signal to the receiver. In the following description, it is assumed that the light receiver is placed on the ceiling surface of the room where the microphone is used.

"Position" is a relative positional relationship in a three-dimensional space of each part that constitutes an article (a microphone or a transmitter in the following embodiments).

"Positional displacement" is a change in the relative positional relationship in the three-dimensional space of each part that constitutes the article. That is, for example, the displacement of the posture of the article is caused by the article rotating, tilting, or moving as a result of the application of an external force to the article.

● Wireless microphone (1) ●
●Configuration of Wireless Microphone (1) FIG. 1 is a front view showing an embodiment of a microphone according to the present invention.
A microphone 1 picks up a sound wave from a sound source (not shown), generates an audio signal based on the sound wave, and outputs the audio signal. The microphone 1 is a so-called handheld wireless microphone that transmits audio signals using infrared communication, for example, in indoor karaoke, meetings, lectures, and the like. The microphone 1 is held by the user of the microphone 1 when in use.

FIG. 2 is a functional block diagram of the microphone 1. As shown in FIG.
The microphone 1 includes a grip housing 10 (see FIG. 1), a head case 11 (see FIG. 1), a diffusion case 12, a driver unit 13, a modulation section 14, a light emitting section 15, and a light guiding section 16. , a control unit 17 , a switching unit 18 , a power supply unit 19 , and a circuit board 20 .

The grip housing 10 (see FIG. 1) accommodates the modulation section 14, the light emitting section 15, the control section 17, the switching section 18, the power supply section 19, and the circuit board 20, and also serves as a grip for the microphone 1. function as The grip housing 10 is made of metal such as aluminum alloy, for example. The grip housing 10 is cylindrical.

The head case 11 (see FIG. 1) accommodates the driver unit 13 and protects the driver unit 13 from dust, wind, and the like. The head case 11 is attached to one open end (hereinafter referred to as “first open end”) of the two open ends of the grip housing 10 .

The diffusion case 12 accommodates the light guide section 16 , diffuses the light guided by the light guide section 16 , and radiates the light to the outside of the microphone 1 . Diffusion case 12 is an example of a diffusion section in the present invention. The diffusion case 12 is made of a synthetic resin such as polycarbonate, which is processed to diffuse and transmit light (infrared rays). The diffusion case 12 has a bottomed cylindrical shape with one end open. That is, the diffusion case 12 has a tubular portion 121 and a bottom portion 122 (see FIG. 1). The diffusion case 12 has an open end facing the grip housing 10, and one of the two open ends of the grip housing 10, which is opposite to the first open end (hereinafter referred to as the “second open end”). can be attached to

The diffusion case 12 diffuses the light guided by the light guiding section 16 so that the light is emitted in an inverted cone shape, for example. The angle range in which the diffusion case 12 emits light is set, for example, to exceed 120° from the position where the light from the light guide section 16 enters.

Driver unit 13 generates an audio signal based on sound waves from a sound source. The driver unit 13 is, for example, a unidirectional dynamic microphone unit. Driver unit 13 is an example of an electroacoustic transducer in the present invention. The driver unit 13 is housed in the head case 11 . An audio signal from the driver unit 13 is output to the modulation section 14 .

The directivity of the driver unit in the present invention is not limited to unidirectional. Also, the type of the driver unit in the present invention is not limited to the dynamic type.

The modulation section 14 generates a modulation signal for modulating the frequency and intensity of the light (infrared rays) output from the light emitting section 15 based on the audio signal from the driver unit 13 . The modulation method of the modulation unit 14 is, for example, the FM frequency modulation method. Modulator 14 is, for example, a known modulation circuit. The modulating section 14 is mounted on the circuit board 20 . A modulated signal from the modulator 14 is output to the light emitter 15 .

The light emitting unit 15 emits light based on the modulated signal from the modulating unit 14 and outputs light (infrared signal) carrying the audio signal. That is, the light emitting section 15 is an example of the light source in the present invention. The light emitting unit 15 is, for example, a laser diode that outputs infrared light having a wavelength in the infrared band (840 nm±10 nm, for example). The light emitting section 15 is connected to the circuit board 20 and receives power supply from the power supply section 19 via the circuit board 20 .

FIG. 3 is a partially enlarged perspective view of the microphone 1 viewed from the second open end side.
In the figure, the dashed line shows how the light from the light emitting section 15 is guided to the light guide section 16 and diffused by the diffusion case 12 . For convenience of explanation, the diagram omits the illustration of the adjustment of the light flux by the optical adjustment unit, which will be described later (the same applies hereinafter).

The light emitting unit 15 is housed in a portion of the grip housing 10 on the second opening end side, and the grip housing is mounted so that the optical axis Ax of the light emitted from the light emitting unit 15 is along the central axis direction (longitudinal direction) of the grip housing 10. It is fixed within the body 10 .

The optical axis of the light emitted from the light-emitting portion in the present invention may or may not coincide with the central axis of the grip housing. Moreover, the same optical axis may be tilted with respect to the same central axis as long as the operation of the microphone, which will be described later, can be realized.

The light guide section 16 guides the light from the light emitting section 15 toward the outside of the microphone 1 . The light guide section 16 includes an optical adjustment section (not shown), a first light guide section 161 , a second light guide section 162 and a terminal light guide section 163 .

The optical adjustment section adjusts the luminous flux of light from the light emitting section 15 and guides it to the first light guide section 161 . The optical adjuster is, for example, a collimator lens. That is, the optical adjustment section converts the light flux from the light emitting section 15 having a predetermined divergence angle into a parallel light flux and guides it to the first light guide section 161 .

The first light guide portion 161 guides the light by electrically switching between a reflective state in which the light from the light emitting portion 15 is reflected in the first direction D1 and a transparent state in which the light from the light emitting portion 15 is transmitted. The first light guide section 161 is, for example, a known light control mirror that switches between a reflective state and a transmissive state depending on the applied voltage. For example, the first light guide section 161 is in a reflective state when a positive voltage is applied, and is in a transmissive state when a negative voltage is applied. The first light guide portion 161 includes a first surface 161a that is an incident surface (reflecting surface) of light from the light emitting portion 15, a second surface 161b that is an output surface of light transmitted through the first light guide portion 161, (see FIG. 4). The first light guide portion 161 has a disk shape with a parallel first surface 161a and a second surface 161b.

The “first direction D1” is the direction in which the light reflected by the first surface 161a is guided.

FIG. 4 is a schematic diagram showing how the first light guide section 161 guides (reflects) light.
The figure shows that the light from the light-emitting portion 15 is guided (reflected) toward the cylindrical portion 121 of the diffusion case 12 by the first light guide portion 161 in the reflective state and diffused by the diffusion case 12 . show.

The first light guide section 161 is arranged in front of the light emitting section 15 and on the optical axis Ax in the traveling direction of the light from the light emitting section 15 . A first surface 161a (second surface 161b) of the first light guide section 161 is inclined at an angle of 45° with respect to the optical axis Ax. That is, the angle between the optical axis Ax and the optical axis of the light reflected by the first surface 161a is 90°. That is, the first direction D1 is orthogonal to the optical axis Ax.

Return to FIG.
The second light guide portion 162 electrically switches between a reflective state in which the light that has passed through the first light guide portion 161 is reflected in the third direction D3 and a transmission state in which the light that has passed through the first light guide portion 161 is transmitted. Switch to and guide the light. The second light guide section 162 is, for example, a known light control mirror that switches between a reflective state and a transmissive state depending on the applied voltage. For example, when a positive voltage is applied, the second light guide section 162 is in a reflective state, and when a negative voltage is applied, it is in a transmissive state. The second light guide portion 162 has a first surface 162a that is an incident surface (reflecting surface) of light from the first light guide portion 161 and a second surface that is an output surface of light transmitted through the second light guide portion 162. 162b and (see FIG. 5). The second light guide portion 162 has a disc shape with a parallel first surface 162a and a second surface 162b.

The "third direction D3" is the direction in which the light reflected by the first surface 162a is guided.

FIG. 5 is a schematic diagram showing how the first light guide section 161 and the second light guide section 162 guide light.
In the figure, the light from the light emitting part 15 is transmitted through the first light guide part 161 in a transparent state, guided (reflected) toward the cylindrical part 121 of the diffusion case 12 by the second light guide part 162, It shows that it is diffused by the diffusion case 12 .

The second light guide section 162 is arranged in front of the first light guide section 161 and on the optical axis Ax in the traveling direction of the light from the light emitting section 15 . The first surface 162a (second surface 162b) of the second light guide section 162 is inclined at an angle of 45° with respect to the optical axis Ax. That is, the angle between the optical axis Ax and the optical axis of the light reflected by the first surface 162a is 90°. That is, the third direction D3 is orthogonal to the optical axis Ax.

Return to FIG.
The terminal light guide portion 163 guides the light transmitted through the second light guide portion 162 in the second direction D2. The terminal light guide part 163 is a reflecting mirror that totally reflects light. The terminal light guide portion 163 has a reflecting surface 163a (see FIG. 6) that reflects the light from the second light guide portion 162 . The terminal light guide part 163 is disc-shaped.

The "second direction D2" is the direction in which the light reflected by the reflecting surface 163a is guided.

FIG. 6 is a schematic diagram showing how the first light guide portion 161, the second light guide portion 162, and the end light guide portion 163 guide light.
In the figure, the light from the light emitting part 15 is transmitted through the first light guide part 161 and the second light guide part 162 which are in a transmitting state, and is directed to the cylindrical part 121 of the diffusion case 12 by the terminal light guide part 163. It shows that it is guided (reflected) and diffused by the diffuser case 12 .

The terminal light guide portion 163 is arranged in front of the second light guide portion 162 and on the optical axis Ax in the traveling direction of the light from the light emitting portion 15 . That is, in the present embodiment, the terminal light guide section 163 is arranged closer to the terminal side of the microphone 1 than the first light guide section 161 and the second light guide section 162 are. A reflective surface 163a of the terminal light guide portion 163 is inclined at an angle of 45° with respect to the optical axis Ax. That is, the angle between the optical axis Ax and the optical axis of the light reflected by the reflecting surface 163a is 90°. That is, the second direction D2 is orthogonal to the optical axis Ax.

3 to 5, the first light guide portion 161, the second light guide portion 162, and the terminal light guide portion 163 are arranged on the optical axis Ax and fixed by a fixing member (not shown). . The first surface 162a of the second light guide portion 162 rotates the first light guide portion 161 clockwise about the optical axis Ax by 120° in the axial direction of the optical axis Ax viewed from the light emitting portion 15 side. It is parallel to the first surface 161a when folded. The reflective surface 163a of the terminal light guide portion 163 is parallel to the first surface 161a when the first light guide portion 161 is rotated 120° counterclockwise about the optical axis Ax when viewed from the coaxial direction.

FIG. 7 is a schematic diagram showing the relationship between the first direction D1, the second direction D2, and the third direction D3 with respect to the optical axis Ax. The arrows in the figure indicate the orientations of the first direction D1, the second direction D2, and the third direction D3 when viewed in the axial direction of the optical axis Ax.

The angle formed by the first direction D1 and the second direction D2 is 120° when viewed in the axial direction of the optical axis Ax. The angle formed by the first direction D1 and the third direction D3 is 120° when viewed in the axial direction of the optical axis Ax. The angle formed by the second direction D2 and the third direction D3 is 120° when viewed in the axial direction of the optical axis Ax. That is, the angle formed by the first direction D1 and the second direction D2 is equal to the angle formed by the first direction D1 and the third direction D3, and is equal to the angle formed by the second direction D2 and the third direction D3. That is, the first direction D1 is different from the second direction D2 and is also different from the third direction D3. The second direction D2 is different from the third direction D3.

Return to FIG.
In this way, the light guide portion 16 (the first light guide portion 161, the second light guide portion 162, the terminal light guide portion 163) is fixed at a predetermined position with respect to the light emitting portion 15, which is the light source, by a fixing member (not shown). fixed by That is, the light guide section 16 is fixed in a non-movable state with respect to the light emitting section 15 .

The control unit 17 outputs a control signal and controls the overall operation of the microphone 1 based on the displacement of the posture of the light guide unit 16 with respect to the reference direction. The control unit 17 includes, for example, processors such as CPU (Central Processing Unit) and MPU (Micro Processing Unit), integrated circuits such as ASIC (Application Specific Integrated Circuit) and FPGA (Field Programmable Gate Array), and ROM (Read Only Memory) and a semiconductor memory device such as RAM (Random Access Memory). The controller 17 is mounted on the circuit board 20 . The control unit 17 includes a sensor unit 171 , a calculation unit 172 and a signal generation unit 173 . Reference directions and control signals will be described later.

The sensor unit 171 detects displacement (inclination) of the sensor unit 171 itself. The sensor unit 171 is, for example, an acceleration sensor.

The sensor unit may be configured by any one of sensors capable of detecting inclination, such as an acceleration sensor, a geomagnetic sensor, and an angular velocity sensor, or a combination thereof.

FIG. 8 is a schematic diagram showing the relationship between the sensor section 171, the optical axis Ax, the first direction D1, the second direction D2, and the third direction D3. "●" in the figure indicates the origin of the sensor section 171, "X", "Y", and "Z" in the figure indicate the reference axes of the sensor section 171 that are orthogonal to each other, and the broken arrows in the figure indicate the direction of gravity G. show. The direction of gravity G is an example of a reference direction in the present invention.

The sensor unit 171 is mounted on the circuit board 20 (see FIG. 2), for example, so that one of the reference axes (the reference axis X in this embodiment) is parallel to the optical axis Ax. By specifying the relationship between the origin of the sensor unit 171, the reference axes X, Y, and Z, and the optical axis Ax in this way, the reference axes X, Y, and Z of the sensor unit 171, the first direction D1, and the second direction D1 are determined. The positional relationship between the direction D2 and the third direction D3 can be specified. The positional relationships between the reference axes X, Y, and Z of the sensor section 171 and the first direction D1, the second direction D2, and the third direction D3 are stored in the calculation section 172 (see FIG. 2). The sensor unit 171 detects displacements of the reference axes X, Y, and Z with respect to the direction of gravity G, and outputs the detection result to the calculation unit 172 .

Based on the detection result of the sensor unit 171 (displacement of the reference axes X, Y, and Z with respect to the direction of gravity G), the calculation unit 172 (see FIG. 2) determines a first direction D1, a second direction D2, and a second direction D2 with respect to the direction of gravity G. A displacement in each of the three directions D3 is calculated. That is, the sensor unit 171 and the calculation unit 172 detect displacement of the posture of the light guide unit 16 by detecting displacements in the first direction D1, the second direction D2, and the third direction D3 with respect to the direction of gravity G. . That is, the sensor section 171 and the calculation section 172 function as a detection section in the present invention. The detection result of the calculation unit 172 (that is, the detection result of the detection unit) is output to the signal generation unit 173 (see FIG. 2).

Return to FIG.
The signal generation unit 173 generates a control signal based on the detection result of the detection unit (displacement of the posture of the light guide unit 16 ) and outputs the control signal to the switching unit 18 . Generation of the control signal will be described later.

The “control signal” is a signal for switching the traveling direction of the light (first direction D1, second direction D2, third direction D3) guided by the light guide section 16 . The control signals include a first reflection signal for switching the first light guide section 161 to the reflection state, a first transmission signal for switching the first light guide section 161 to the transmission state, and a first transmission signal for switching the second light guide section 162 to the reflection state. 2 reflection signal and a second transmission signal for switching the second light guide 162 to the transmission state. The control signal is output to the switching section 18 .

The switching unit 18 switches the traveling direction of the light guided by the light guide unit 16 by controlling the power applied from the power supply unit 19 to the light guide unit 16 based on the control signal from the control unit 17 . The switching unit 18 is, for example, a known circuit that switches the voltage of the power supply applied from the power supply unit 19 to the light guide unit 16 between positive and negative. That is, for example, the switching unit 18 applies a positive voltage to the first light guide unit 161 based on the first reflected signal to switch the first light guide unit 161 to the reflective state, and switches the first light guide unit 161 to the reflective state based on the first transmitted signal. A negative voltage is applied to the first light guide portion 161 to switch the first light guide portion 161 to the transmission state, and a positive voltage is applied to the second light guide portion 162 based on the second reflected signal to switch the second light guide portion. The portion 162 is switched to the reflective state, and a negative voltage is applied to the second light guide portion 162 based on the second transmission signal to switch the second light guide portion 162 to the transmissive state. The switching section 18 is mounted on the circuit board 20 .

The power supply unit 19 supplies power to the light emitting unit 15 , the light guide unit 16 (switching unit 18 ), and the control unit 17 via the circuit board 20 , for example. The power supply unit 19 is, for example, a rechargeable battery such as a nickel metal hydride rechargeable battery. The power supply unit 19 is housed in the grip housing 10 .

The circuit board 20 mounts circuits necessary for the operation of the microphone 1 such as the modulation section 14 , the control section 17 and the switching section 18 . The circuit board 20 is connected to the power supply section 19 and receives power from the power supply section 19 . The circuit board 20 is housed in the grip housing 10 .

Here, the modulation section 14, the light emitting section 15, the light guiding section 16, the control section 17, and the switching section 18 constitute a wireless transmitter according to the present invention. That is, the microphone 1 comprises a wireless transmitter according to the invention.

●Operation of wireless microphone (1) Next, the operation of the microphone 1 will be described.

FIG. 9 is a flow chart showing the operation of the microphone 1. FIG.
First, the detection unit (the sensor unit 171 and the calculation unit 172) detects the displacement of the posture of the light guide unit 16 (S1). A detection result of the detection unit is output to the signal generation unit 173 .

Next, the signal generation unit 173 (control unit 17) determines the current orientations of the first direction D1, the second direction D2, and the third direction D3 with respect to the direction of gravity G, that is, the current orientations, based on the detection result of the detection unit. The posture of the light guide section 16 is specified (S2).

Next, the signal generation unit 173 specifies the direction closest to the light receiver arranged on the ceiling (hereinafter referred to as "light receiver direction") among the first direction D1, the second direction D2, and the third direction D3. (S3). The direction of the light receiver in the present embodiment is the most upward direction (the direction opposite to the direction of gravity G) among the first direction D1, the second direction D2, and the third direction D3.

FIG. 10 is a schematic diagram showing an example of how the signal generator 173 identifies the direction of the light receiver.
For example, the signal generation unit 173 calculates an angle (hereinafter referred to as “first angle”) α1 formed between the direction of gravity G, which is the reference direction, and the first direction D1, and an angle ( An angle (hereinafter referred to as a "third angle") α3 formed by the direction of gravity G and the third direction D3 (hereinafter referred to as a "second angle") α2 is calculated, and the first angle α1 and the second angle α2 are calculated. and the third angle α3, respectively, to identify the direction of the light receiver. That is, for example, when the first angle α1 is greater than each of the second angle α2 and the third angle α3 (α1>α2, α1>α3), the signal generator 173 specifies that the first direction D1 is the light receiver direction. do.

Return to FIG.
Next, the signal generation section 173 generates a control signal corresponding to the specified light receiver direction (S4). That is, when the signal generator 173 identifies that the first direction D1 is the direction of the light receiver (eg, α1>α2, α1>α3 in FIG. 10), the signal generator 173 generates the first reflected signal. The signal generator 173 generates a first transmission signal and a second transmission signal when the second direction D2 is specified as the direction of the light receiver (eg, α2>α1, α2>α3 in FIG. 10). The signal generator 173 generates a first transmitted signal and a second reflected signal when the third direction D3 is specified as the light receiver direction (for example, α3>α1, α3>α1α2 in FIG. 10). That is, the control unit 17 generates the control signal based on the first angle α1, the second angle α2, and the third angle α3. The control signal is output to the switching section 18 .

Next, the switching section 18 switches the traveling direction of the light guided by the light guide section 16 based on the control signal (S5).

FIG. 11 is a schematic diagram showing an example of switching the direction of travel of the light guided by the light guide section 16. As shown in FIG. In the figure, the state in which the optical axis Ax is parallel to the horizontal direction (the longitudinal direction of the microphone 1 is parallel to the horizontal direction), and the state in which the first direction D1 faces directly upward in the vertical direction is 0°. The orientations of a first direction D1, a second direction D2, and a third direction D3 when the posture of the light guide section 16 is displaced (rotated) between 0° and 360° about the optical axis Ax are shown. In the figure, the direction in which the light is guided by the light guide 16 (the direction of the light receiver) is indicated by a thick arrow and a fan-shaped symbol.

When the posture of the light guide portion 16 is displaced between 0° and 60°, the first angle α1 is greater than the second angle α2 and the third angle α3, respectively, and the light receiver direction is the first direction D1. At this time, the signal generator 173 generates a first reflected signal and outputs it to the switching section 18 . The switching section 18 applies a positive voltage to the first light guide section 161 to switch the first light guide section 161 to the reflective state. As a result, the light from the light emitting section 15 is reflected (guided) in the first direction D<b>1 by the first light guide section 161 .

When the posture of the light guide portion 16 is displaced between 60° and 180°, the second angle α2 is greater than the first angle α1 and the third angle α3, respectively, and the light receiver direction is the second direction D2. At this time, the signal generation section 173 generates a first transmission signal and a second transmission signal and outputs them to the switching section 18 . The switching section 18 applies a negative voltage to the first light guide section 161 to switch the first light guide section 161 to the transmission state, and applies a negative voltage to the second light guide section 162 to switch the second light guide section 161 to the second light guide section 161 . Switch the portion 162 to the transparent state. As a result, the light from the light emitting section 15 passes through the first light guide section 161 and the second light guide section 162 and is reflected (guided) in the second direction D2 by the end light guide section 163 .

When the posture of the light guide portion 16 is displaced between 180° and 300°, the third angle α3 is greater than the first angle α1 and the second angle α2, respectively, and the light receiver direction is the third direction D3. At this time, the signal generator 173 generates a first transmitted signal and a second reflected signal and outputs them to the switching section 18 . The switching section 18 applies a negative voltage to the first light guide section 161 to switch the first light guide section 161 to the transmission state, and applies a positive voltage to the second light guide section 162 to switch the second light guide section 161 to the second light guide section 161 . Switch the portion 162 to the reflective state. As a result, the light from the light emitting section 15 passes through the first light guide section 161 and is reflected (guided) in the third direction D3 by the second light guide section 162 .

When the posture of the light guide portion 16 is displaced between 300° and 360°, the first angle α1 is greater than the second angle α2 and the third angle α3, respectively, and the light receiver direction is the first direction D1. At this time, the signal generator 173 generates a first reflected signal and outputs it to the switching section 18 . The switching section 18 applies a positive voltage to the first light guide section 161 to switch the first light guide section 161 to the reflective state. As a result, the light from the light emitting section 15 is reflected (guided) in the first direction D<b>1 by the first light guide section 161 .

When the orientation of the light guide is 60°, the directions of the light receiver are the first direction and the second direction. At this time, the direction of the light guided by the light guide may be maintained, for example, in the direction previously guided by the light guide. That is, the signal generator (controller) does not have to generate the control signal. The same applies when the orientation of the light guide is 180° and 300°.

Returning to FIGS. 4-6.
The light guided by the light guide section 16 is guided to the cylindrical section 121 of the diffusion case 12 . The diffusion case 12 diffuses the incident light and emits it to the outside of the diffusion case 12 .

Here, the microphone 1 is arranged not only in a state in which the optical axis Ax is parallel to the horizontal direction, but also in a state in which the optical axis Ax is non-parallel to the horizontal direction (a state in which the optical axis Ax is tilted with respect to the horizontal direction). , the operation is similar to that described above. Further, when the microphone 1 does not rotate around the optical axis Ax and only the tilt of the microphone 1 changes (for example, the light guide section 16 moves up and down so as to draw an arc around the head case 11). When moving), the operation is similar to that described above.

FIG. 12 is a schematic diagram showing examples of the first angle α1, the second angle α2, and the third angle α3 when the head case 11 is positioned above the light guide section 16. FIG.
In the figure, for convenience of explanation, the state of the microphone 1 is indicated by a chain double-dashed line. The figure shows that the light guide portion 16 is positioned obliquely below the head case 11 (the direction of the light source is obliquely downward), and that the first angle α1 is greater than each of the second angle α2 and the third angle α3. show. In this case, the signal generator 173 identifies that the first direction D<b>1 is the light receiver direction, generates the first reflected signal, and outputs the first reflected signal to the switcher 18 . As a result, the light from the light emitting section 15 is guided in the first direction D1, which is the direction of the light receiver.

FIG. 13 shows a state in which the light guide section 16 moves upward around the head case 11 from the state shown in FIG. , a second angle α2, and a third angle α3.
In the figure, for convenience of explanation, the state of the microphone 1 is indicated by a chain double-dashed line. The drawing shows that the light guide portion 16 is positioned obliquely above the head case 11 (the direction of the light source is obliquely above), and that the third angle α3 is greater than the first angle α1 and the second angle α2. show. In this case, the signal generator 173 identifies that the third direction D3 is the light receiver direction, generates the first transmission signal and the second reflection signal, and outputs them to the switching section 18 . As a result, the light from the light emitting section 15 is guided in the third direction D3, which is the direction of the light receiver.

In this way, the control unit 17 controls at least one of the first reflected signal, the first transmitted signal, the second reflected signal, and the second transmitted signal based on the displacement of the posture of the light guide unit 16 with respect to the direction of gravity G. to the switching unit 18. The switching unit 18 switches the traveling direction of the light guided by the light guiding unit 16 based on the control signal. As a result, the microphone 1 according to the present embodiment can efficiently transmit infrared signals toward the light receiver regardless of the posture of the microphone 1 .

●Summary (1)
According to the embodiment described above, the switching section 18 switches between the reflective state and the transmissive state of each of the first light guide section 161 and the second light guide section 162 based on the displacement of the posture of the light guide section 16. Thereby, the traveling direction of the light guided by the light guide section 16 is switched. Therefore, the microphone 1 transmits infrared signals only toward the light receiver. That is, the microphone 1 according to the present embodiment efficiently transmits infrared signals toward the light receiver regardless of the posture of the microphone 1 (orientation of the light source).

The angle formed by the first direction D1 and the second direction D2 is equal to the angle formed by the second direction D2 and the third direction D3, and is also equal to the angle formed by the first direction D1 and the third direction D3. That is, the first direction D1, the second direction D2, and the third direction D3 are set to face directions equiangularly (120°) apart from each other about the optical axis Ax. Therefore, the microphone 1 according to the present embodiment does not form a blind spot even if it rotates in any direction about the optical axis Ax, and efficiently transmits infrared signals to the light receiver.

Furthermore, the first direction D1, the second direction D2, and the third direction D3 are orthogonal to the optical axis Ax. Therefore, when the tilt of the optical axis Ax is fixed, the microphone 1 according to the present embodiment transmits an infrared signal with a stable intensity to the light receiver regardless of the rotation around the optical axis Ax in any direction.

Furthermore, based on the first angle α1, the second angle α2, and the third angle α3, the control unit 17 (signal generation unit 173) generates the first reflected signal, the first transmitted signal, and the second reflected signal and a second transmission signal. Therefore, the microphone 1 outputs an infrared signal toward the direction closest to the light receiver (light receiver direction) among the first direction D1, the second direction D2, and the third direction D3. That is, the microphone 1 according to the present embodiment efficiently transmits infrared signals toward the light receiver regardless of the posture of the microphone 1 (orientation of the light source).

Furthermore, the light guide section 16 is fixed in a non-movable state with respect to the light emitting section 15 . That is, the light guide section 16 can switch the traveling direction of the light from the light emitting section 15 without having a movable section. Therefore, the microphone 1 according to the present embodiment has excellent durability against shocks such as being dropped, and the light guiding portion is made smaller than conventional wireless microphones that guide the light from the light source through the movable portion. enable

Furthermore, the light guided by the light guide section 16 is diffused by the diffusion case 12 (diffusion section). Therefore, the microphone 1 according to the present embodiment can use a laser with high directivity and convergence as a light source. It is possible to reduce the size of the light guide section 16 .

Furthermore, the light guided by the light guide section 16 is guided to the cylindrical section 121 of the diffusion case 12 . Therefore, the diffusion case 12 diffuses and radiates the light guided by the light guide section 16 in the circumferential direction of the diffusion case 12 .

Note that the first direction, the second direction, and the third direction are separated from each other at equal angular intervals around the optical axis if there is an overlapping portion in the range of the light diffused by the diffusion case (diffusion portion) in each direction. It doesn't have to be. That is, for example, the angle formed by the first direction and the second direction is the same as the angle formed by the first direction and the third direction, and is different from the angle formed by the second direction and the third direction. good. Alternatively, the angle between the first direction and the second direction may be different from the angle between the first direction and the third direction and the angle between the second direction and the third direction.

Also, the angles formed by the first direction, the second direction, the third direction, and the optical axis need not be right angles. That is, for example, the angles formed by each of the first direction, the second direction, and the third direction and the optical axis may be acute angles toward the light emitting unit side, or may be obtuse angles toward the light emitting unit side. Also, for example, the angle between the first direction and the optical axis may be different from the angle between the second direction and the optical axis and the angle between the third direction and the optical axis. Similarly, the angle between the second direction and the optical axis may be different from the angle between the third direction and the optical axis.

Furthermore, the change in the states of the first light guide section and the second light guide section is not limited to this embodiment. That is, for example, the first light guide section and the second light guide section may be in a reflective state when a negative voltage is applied, and may be in a transmissive state when a positive voltage is applied.

Furthermore, the first light guide section and the second light guide section may maintain the transmissive state or the reflective state after a predetermined voltage is applied until the next opposite voltage is applied. , the transmissive state or the reflective state may be maintained only while a predetermined voltage is applied.

Furthermore, the light guide section may function as a terminal light guide section with a dimmer mirror instead of the reflecting mirror. That is, for example, when the terminal light guide is in the transmissive state, the light from the light emitter is guided to the bottom of the diffusion case. In this case, the second direction is the direction in which the distal light guide reflects light when the distal light guide is in the reflective state. At this time, the switching section switches between the reflective state and the transmissive state of the terminal light guide section.

Furthermore, the shape of each of the first light guide portion, the second light guide portion, and the terminal light guide portion is not limited to a disc shape. That is, for example, the shapes of the first light guide portion, the second light guide portion, and the end light guide portion may each be curved in a bowl shape, or may be a shape in which only the incident surface (reflecting surface) is curved.

Furthermore, the terminal light guide may not be arranged on the terminal side of the microphone among the light guides. That is, for example, when the distal light guide is composed of a dimmer mirror, the light guide may include another mirror arranged closer to the distal end of the microphone than the distal light guide.

Furthermore, the light guide section in the embodiments described above is composed of two dimmer mirrors and one reflecting mirror. Alternatively, the light guide section in the present invention may be composed of three or more light control mirrors and one reflecting mirror, or may be composed of one light control mirror and one reflecting mirror. .

● Wireless microphone (2) ●
Next, another embodiment of the wireless microphone according to the present invention will be described, focusing on the differences from the previously described embodiment (hereinafter referred to as "first embodiment"). The present embodiment (hereinafter referred to as "second embodiment") differs from the first embodiment in that the light guide portion does not include the second light guide portion.

●Configuration of Wireless Microphone (2) FIG. 14 is a functional block diagram showing another embodiment of the microphone.
In the figure, members denoted by the same reference numerals as those in other drawings have the same configurations and functions as members shown in other drawings.

The microphone 1A includes a grip housing 10 (see FIG. 1), a head case 11 (see FIG. 1), a diffusion case 12, a driver unit 13, a modulating section 14, a light emitting section 15, and a light guiding section 16A. , a control unit 17A, a switching unit 18A, a power supply unit 19, and a circuit board 20.

The light guide section 16A guides the light from the light emitting section 15 toward the outside of the microphone 1A. 16 A of light guide parts are provided with the 1st light guide part 161 and 163 A of terminal light guide parts.

FIG. 15 is a schematic diagram showing how the first light guide portion 161 and the terminal light guide portion 163A guide light.
The figure shows that the light from the light emitting portion 15 is transmitted through the first light guide portion 161 in the transmitting state, guided toward the diffusion case 12 by the terminal light guide portion 163A, and diffused by the diffusion case 12. show.

The terminal light guide portion 163A guides the light transmitted through the first light guide portion 161 in the second direction D2A. 163 A of terminal light guide parts are reflection mirrors which totally reflect light. The terminal light guide portion 163A has a reflecting surface 163Aa that reflects the light from the first light guide portion 161 . 163 A of terminal light guide parts are disk-shaped.

The "second direction D2A" is the direction in which the light reflected by the reflecting surface 163Aa is guided.

The terminal light guide portion 163A is arranged in front of the first light guide portion 161 and on the optical axis Ax in the traveling direction of the light from the light emitting portion 15 . That is, in the present embodiment, the terminal light guide section 163A is arranged closer to the terminal side of the microphone 1A than the first light guide section 161 is. A reflective surface 163Aa of the terminal light guide portion 163A is inclined at an angle of 45° with respect to the optical axis Ax. That is, the angle between the optical axis Ax and the optical axis of the light reflected by the reflecting surface 163Aa is 90°. That is, the second direction D2A is orthogonal to the optical axis Ax.

The first light guide portion 161 and the terminal light guide portion 163A are arranged on the optical axis Ax and fixed by a fixing member (not shown). The reflective surface 162Aa of the terminal light guide portion 163A is the same when the first light guide portion 161 is rotated 180° clockwise about the optical axis Ax in the axial direction of the optical axis Ax viewed from the light emitting portion 15 side. is parallel to the first surface 161a of the .

FIG. 16 is a schematic diagram showing the relationship between the first direction D1 and the second direction D2A with respect to the optical axis Ax. The arrows in the figure indicate the orientations of the first direction D1 and the second direction D2A when viewed in the axial direction of the optical axis Ax.

The angle formed by the first direction D1 and the second direction D2A is 180° when viewed in the axial direction of the optical axis Ax. That is, the first direction D1 is a direction opposite to the second direction D2A. That is, the first direction D1 is different from the second direction D2A.

Return to FIG.
In this manner, the light guide portion 16A (the first light guide portion 161 and the terminal light guide portion 163A) is fixed at a predetermined position with respect to the light emitting portion 15, which is the light source, by a fixing member (not shown). That is, the light guide portion 16A is fixed in a non-movable state with respect to the light emitting portion 15 .

The control section 17A outputs a control signal based on the displacement of the posture of the light guide section 16A with respect to the reference direction, and controls the overall operation of the microphone 1A. 17 A of control parts are comprised by processors, such as CPU and MPU, integrated circuits, such as ASIC and FPGA, and semiconductor memory elements, such as ROM and RAM, for example. The control unit 17A is mounted on the circuit board 20. As shown in FIG. 17 A of control parts are provided with the sensor part 171, 172 A of calculating parts, and 173 A of signal production|generation parts.

The calculation unit 172A calculates displacements in the first direction D1 and the second direction D2A with respect to the direction of gravity G based on the detection results of the sensor unit 171 (displacements of the reference axes X, Y, and Z with respect to the direction of gravity G). The sensor section 171 and the calculation section 172A function as a detection section in the present invention. The detection result of the calculation unit 172A (that is, the detection result of the detection unit) is output to the signal generation unit 173A.

The signal generation unit 173A generates a control signal based on the detection result of the detection unit (displacement of the posture of the light guide unit 16A) and outputs the control signal to the switching unit 18A. Generation of the control signal will be described later.

The "control signal" is a signal for switching the traveling direction (first direction D1, second direction D2A) of light guided by the light guide portion 16A. The control signal includes a first reflection signal for switching the first light guide section 161 to the reflection state and a first transmission signal for switching the first light guide section 161 to the transmission state. The control signal is output to the switching section 18A.

The switching section 18A switches the traveling direction of the light guided by the light guiding section 16A by controlling the power applied from the power supply section 19 to the light guiding section 16A based on the control signal from the control section 17A. The switching unit 18A is, for example, a known circuit that switches between positive and negative voltage of the power source applied from the power source unit 19 to the light guide unit 16A. That is, for example, the switching unit 18A applies a positive voltage to the first light guide unit 161 based on the first reflected signal to switch the first light guide unit 161 to the reflective state, and switches the first light guide unit 161 to the reflective state based on the first transmitted signal. A negative voltage is applied to the first light guide portion 161 to switch the first light guide portion 161 to the transmission state. The switching section 18A is mounted on the circuit board 20 .

●Operation of Wireless Microphone (2) Next, the operation of the microphone 1A will be described.

FIG. 17 is a flow chart showing the operation of the microphone 1A.
First, the detection unit (the sensor unit 171, the calculation unit 172A) detects the displacement of the posture of the light guide unit 16A (S11). A detection result of the detection unit is output to the signal generation unit 173A.

Next, the signal generation unit 173A (control unit 17A) determines the current directions of the first direction D1 and the second direction D2A with respect to the direction of gravity G, that is, the current direction of the light guide unit 16A, based on the detection result of the detection unit. A posture is specified (S12).

Next, the signal generator 173A specifies the direction of the light receiver from among the first direction D1 and the second direction D2A (S13). The direction of the light receiver in the present embodiment is the most upward direction (opposite direction to the gravitational direction G) of the first direction D1 and the second direction D2A.

FIG. 18 is a schematic diagram showing an example of how the signal generator 173A identifies the direction of the light receiver.
For example, the signal generation unit 173A calculates an angle (hereinafter referred to as "first angle") α1 formed between the direction of gravity G, which is the reference direction, and the first direction D1, and an angle ( (hereinafter referred to as “second angle”) α2A, and by comparing the first angle α1 and the second angle α2A, the direction of the light receiver is specified. That is, for example, when the first angle α1 is greater than the second angle α2A (α1>α2), the signal generator 173A identifies the first direction D1 as the light receiver direction.

Return to FIG.
Next, the signal generation section 173A generates a control signal corresponding to the specified light receiver direction (S14). That is, the signal generator 173A generates the first reflection signal when the first direction D1 is specified as the light receiver direction (eg, α1>α2A in FIG. 16). The signal generator 173A generates a first transmission signal when the second direction D2A is specified as the light receiver direction (eg, α2A>α1 in FIG. 16). That is, the controller 17A generates a control signal based on the first angle α1 and the second angle α2A. The control signal is output to the switching section 18A.

Next, the switching section 18A switches the traveling direction of the light guided by the light guide section 16A based on the control signal (S15).

FIG. 19 is a schematic diagram showing an example of switching the traveling direction of the light guided by the light guide section 16A. In the figure, the state in which the optical axis Ax is parallel to the horizontal direction (the longitudinal direction of the microphone 1 is parallel to the horizontal direction), and the state in which the first direction D1 faces directly upward in the vertical direction is 0°. The directions of the first direction D1 and the second direction D2A when the posture of the light guide section 16 is displaced (rotated) between 0° and 360° about the optical axis Ax are shown. In the figure, the direction in which light is guided by the light guide portion 16A (the direction of the light receiver) is indicated by a thick arrow and a fan-shaped symbol. In the figure, the optical axis Ax is indicated by "●".

When the posture of the light guide portion 16A is displaced between 0° and 90°, the first angle α1 is greater than the second angle α2A, and the light receiver direction is the first direction D1. At this time, the signal generator 173A generates a first reflected signal and outputs it to the switcher 18A. The switching section 18A applies a positive voltage to the first light guide section 161 to switch the first light guide section 161 to the reflective state. As a result, the light from the light emitting section 15 is reflected (guided) in the first direction D<b>1 by the first light guide section 161 .

When the posture of the light guide portion 16A is displaced between 90° and 270°, the second angle α2A is greater than the first angle α1, and the light receiver direction is the second direction D2A. At this time, the signal generating section 173A generates a first transmission signal and outputs it to the switching section 18A. The switching section 18A applies a negative voltage to the first light guide section 161 to switch the first light guide section 161 to the transmission state. As a result, the light from the light emitting section 15 passes through the first light guide section 161 and is reflected (guided) in the second direction D2 by the end light guide section 163A.

When the posture of the light guide portion 16A is displaced between 270° and 360°, the first angle α1 is greater than the second angle α2A, and the light receiver direction is the first direction D1. At this time, the signal generator 173A generates a first reflected signal and outputs it to the switcher 18A. The switching section 18A applies a positive voltage to the first light guide section 161 to switch the first light guide section 161 to the reflective state. As a result, the light from the light emitting section 15 is reflected (guided) in the first direction D<b>1 by the first light guide section 161 .

In this manner, the control section 17A outputs the first reflected signal or the first transmitted signal to the switching section 18 based on the displacement of the posture of the light guide section 16A with respect to the direction of gravity G. FIG. 18 A of switching parts switch the advancing direction of the light guided by 16 A of light guide parts based on a control signal. As a result, the microphone 1A according to the present embodiment can efficiently transmit infrared signals toward the light receiver regardless of the posture of the microphone 1A.

●Summary (2)
According to the second embodiment described above, the switching section 18A switches between the reflective state and the transmissive state of the first light guide section 161 based on the displacement of the posture of the light guide section 16A. switch the direction of travel of the light guided by Therefore, the microphone 1A transmits infrared signals only toward the light receiver. That is, the microphone 1A according to the second embodiment efficiently transmits infrared signals toward the light receiver regardless of the posture of the microphone 1A (orientation of the light source).

Also, the first direction D1 is a direction opposite to the second direction D2. That is, the first direction D1 and the second direction D2A are set so as to face directions separated by 180° from each other with respect to the optical axis Ax. Therefore, the microphone 1 according to the second embodiment does not form a blind spot even when rotated in any direction about the optical axis Ax, and efficiently transmits infrared signals to the light receiver.

Furthermore, the first direction D1 and the second direction D2A are orthogonal to the optical axis Ax. Therefore, when the tilt of the optical axis Ax is fixed, the microphone 1A according to the second embodiment transmits an infrared signal of stable intensity to the light receiver regardless of the direction of rotation about the optical axis Ax.

Furthermore, the controller 17A (signal generator 173A) outputs the first reflected signal or the first transmitted signal based on the first angle α1 and the second angle α2A. Therefore, the microphone 1A outputs an infrared signal in the direction closest to the light receiver, out of the first direction D1 and the second direction D2A. That is, the microphone 1A according to the second embodiment efficiently transmits infrared signals toward the light receiver regardless of the posture of the microphone 1A (orientation of the light source).

Furthermore, the light guide section 16A is fixed to the light emitting section 15 in a non-movable state. That is, the light guide section 16A can switch the traveling direction of the light from the light emitting section 15 without having a movable section. Therefore, the microphone 1A according to the second embodiment is superior in durability and enables miniaturization of the light guide section as compared with conventional wireless microphones.

Note that the first direction and the second direction do not have to be separated by 180° from the optical axis as long as the ranges of the light diffused by the diffusing section overlap in each direction.

Also, the angles formed by the first direction, the second direction, and the optical axis may not be right angles.

● Wireless microphone (3) ●
Next, another embodiment of the wireless microphone according to the present invention will be described, focusing on the differences from the first and second embodiments described above. This embodiment (hereinafter referred to as "third embodiment") differs from the second embodiment in the configuration of the diffusion section.

●Configuration of Wireless Microphone (3) FIG. 20 is a schematic diagram showing still another embodiment of the microphone.
In the figure, members denoted by the same reference numerals as those in other drawings have the same configurations and functions as members shown in other drawings.

The microphone 1B includes a grip housing 10, a head case 11 (see FIG. 1), a light guiding section case 12B, a driver unit 13 (see FIG. 2), a modulating section 14 (see FIG. 2), and a light emitting section 15. , a light guide portion 16A, a control portion 17 (see FIG. 2), a switching portion 18 (see FIG. 2), a power supply portion 19 (see FIG. 2), a circuit board 20 (see FIG. 2), and a diffusion portion 21B;

The light guide portion case 12B accommodates the light guide portion 16 . The configuration of the light guide case 12B is the same as the configuration of the diffusion case 12 in the first embodiment, except that the light is not diffused.

The diffusion portion 21B diffuses the light guided by the light guide portion 16 and radiates the light toward the light guide portion case 12B. The diffusion section 21B includes a first diffusion section 211B and a second diffusion section 212B. The first diffusing portion 211B and the second diffusing portion 212B are plate-shaped lenses that have undergone light diffusion processing (for example, uneven processing).

The first diffusion section 211B diffuses the light reflected by the first light guide section 161 . The first diffusion portion 211B is arranged on the optical path of the light reflected by the first light guide portion 161 and between the first light guide portion 161 and the light guide portion case 12B.

The second diffusion section 212B diffuses the light reflected by the end light guide section 163A. The second diffusion part 212B is arranged between the terminal light guide part 163A and the light guide part case 12B on the optical path of the light reflected by the terminal light guide part 163A.

●Summary (3)
According to the third embodiment described above, the diffusing section 21B is configured by a lens corresponding to the light guiding section 16. FIG. Therefore, the microphone 1B more reliably spreads the light guided by the light guide section 16 over a wide range. That is, the microphone 1B according to the third embodiment efficiently transmits infrared signals toward the light receiver regardless of the posture of the microphone 1B.

Note that the diffusion section may be provided in the light guide section. That is, for example, the light guide section may include a first light guide section having a convex (or concave) first surface and a terminal light guide section having a convex (or concave) reflective surface. . In this case, a space for providing the diffusing portion in addition to the light guiding portion is not required, so that the size of the light guiding portion case can be reduced, and the configuration of the light guiding portion and the diffusing portion can be simplified.

Also, the diffusion section may have a configuration corresponding to the light guide section in the first embodiment. That is, for example, the diffusion section may also include a member that reflects the light reflected by the second light guide section.

Further, the first diffusing section and the second diffusing section may be lenses having a concave entrance surface or lenses having a convex exit surface.

●Summary (Others)
Although the reference direction in each of the embodiments described above is the direction of gravity G, the reference direction in the present invention is not limited to the direction of gravity as long as the direction of the light receiver can be specified. That is, for example, the reference direction may be horizontal. In this case, for example, the signal generation unit specifies, of the first direction and the second direction (the third direction), the direction facing the top surface of the horizontal plane and having the largest angle with the horizontal plane as the direction of the light receiver. You may

Further, the detection of the displacement of the posture of the light guide section in the present invention is not limited to each embodiment. That is, for example, the control unit may detect the displacement of the orientation of the light guide unit (orientation in the first direction, the second direction, and the third direction) using another known detection method using sensors. .

Furthermore, the light output by the light-emitting portion in the present invention is not limited to infrared rays as long as it can carry information. That is, for example, the light output by the light emitting unit may be light in the ultraviolet or visible light band.

Furthermore, the light emitting section in the present invention is not limited to laser diodes. That is, for example, the light emitting unit may be an LED.

Furthermore, the light receiver in the present invention may be arranged on the wall surface.

Furthermore, the direction of the light receiver in the present invention is not limited to the most upward direction among the first direction and the second direction (the third direction).

Furthermore, the modulating section and the switching section may be configured by a common processor or integrated circuit with the control section.

1 wireless microphone 12 diffusion case (diffusion part)
13 driver unit 15 light emitting part (light source)
16 light guide portion 161 first light guide portion 162 second light guide portion 163 end light guide portion 17 control portion 171 sensor portion (detection portion)
172 calculation unit (detection unit)
173 Signal generating section 18 Switching section Ax Optical axis D1 First direction D2 Second direction D3 Third direction 1A Wireless microphone 16A Light guiding section 163A Terminal light guiding section 17A Control section 18A Switching section D2A Second direction 1B Wireless microphone 21B Diffusion section

Claims (16)

an electroacoustic transducer that produces an audio signal based on sound waves from a sound source;
a light source that outputs light carrying the audio signal;
a light guide section for guiding the light from the light source;
a detection unit that detects displacement of the posture of the light guide unit;
a control unit that outputs a control signal based on the detection result of the detection unit;
a switching unit that switches a traveling direction of the light guided by the light guide unit based on the control signal;
and
The light guide section
a first light guide section that guides the light by electrically switching between a reflection state in which the light from the light source is reflected in a first direction and a transmission state in which the light from the light source is transmitted;
a terminal light guide section that guides the light transmitted through the first light guide section in a second direction different from the first direction;
with
The switching section switches between the reflective state and the transmissive state of the first light guide section based on the control signal.
A wireless microphone characterized by: The light guide section
a reflection state in which the light transmitted through the first light guide is reflected in a third direction different from the first direction and the second direction; a second light guide section that electrically switches between a transmission state that guides the light to the end light guide section and guides the light;
with
The switching section switches between the reflective state and the transmissive state of the second light guide section based on the control signal.
The wireless microphone of Claim 1. The angle formed by the first direction and the second direction is equal to the angle formed by the first direction and the third direction and the angle formed by the second direction and the third direction, respectively.
A wireless microphone according to claim 2. The first direction, the second direction, and the third direction are orthogonal to the optical axis of the light from the light source,
A wireless microphone according to claim 2. The control signal is
a first reflected signal for switching the first light guide section to the reflective state;
a first transmission signal for switching the first light guide section to the transmission state;
a second reflected signal for switching the second light guide section to the reflective state;
a second transmission signal for switching the second light guide section to the transmission state;
including
The control section generates at least one of the first reflected signal, the first transmitted signal, the second reflected signal, and the second transmitted signal based on the displacement of the attitude of the light guide section with respect to the reference direction. outputs a signal of 1,
A wireless microphone according to claim 2. Based on an angle between the reference direction and the first direction, an angle between the reference direction and the second direction, and an angle between the reference direction and the third direction, , outputting at least one of the first reflected signal, the first transmitted signal, the second reflected signal, and the second transmitted signal;
A wireless microphone according to claim 5. The control unit
when the angle formed by the first direction and the reference direction is larger than the angle formed by the second direction and the reference direction and the angle formed by the third direction and the reference direction, the first reflected signal is generated; output and
when the angle formed by the second direction and the reference direction is larger than the angle formed by the first direction and the reference direction and the angle formed by the third direction and the reference direction, the first transmitted signal and outputting the second transmission signal;
When the angle formed by the third direction and the reference direction is larger than the angle formed by the first direction and the reference direction and the angle formed by the second direction and the reference direction, the first transmitted signal and outputting the second reflected signal;
A wireless microphone according to claim 6. The first direction is a direction opposite to the second direction,
The wireless microphone of Claim 1. The first direction and the second direction are orthogonal to the optical axis of the light from the light source,
The wireless microphone of Claim 1. The control signal is
a first reflected signal for switching the first light guide section to the reflective state;
a first transmission signal for switching the first light guide section to the transmission state;
including
The control unit outputs the first reflection signal or the first transmission signal based on the displacement of the posture of the light guide unit with respect to a reference direction.
The wireless microphone of Claim 1. The control unit outputs the first reflection signal or the first transmission signal based on an angle between the reference direction and the first direction and an angle between the reference direction and the second direction. do,
The wireless microphone of Claim 10. The control unit
outputting the first reflected signal when an angle formed by the first direction and the reference direction is greater than an angle formed by the second direction and the reference direction;
outputting the first transmission signal when an angle formed by the second direction and the reference direction is greater than an angle formed by the first direction and the reference direction;
The wireless microphone of Claim 11. a diffusion section that diffuses the light guided by the light guide section;
comprising
The wireless microphone of Claim 1. the terminal light guide portion reflects the light from the first light guide portion in the second direction,
The wireless microphone of Claim 1. The terminal light guide section electrically switches between a reflection state in which the light from the first light guide section is reflected in the second direction and a transmission state in which the light from the light source is transmitted, thereby guide the
The switching section switches between the reflective state and the transmissive state of the terminal light guide section based on the control signal.
The wireless microphone of Claim 1. a light source that outputs information-carrying light;
a light guide section for guiding the light from the light source;
a detection unit that detects displacement of the posture of the light guide unit;
a control unit that outputs a control signal based on the detection result of the detection unit;
a switching unit that switches a traveling direction of the light guided by the light guide unit based on the control signal;
and
The light guide section
a first light guide section that guides the light by electrically switching between a reflection state in which the light from the light source is reflected in a first direction and a transmission state in which the light from the light source is transmitted;
a terminal light guide section that guides the light transmitted through the first light guide section in a second direction different from the first direction;
with
The switching section switches between the reflective state and the transmissive state of the first light guide section based on the control signal.
A wireless transmitter characterized by:

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