JP7418695B2 - microphone - Google Patents

Description

The present invention relates to a microphone.

Patent Document 1 discloses a microphone switch structure. A hanger plate electrically connected to a first contact of the circuit board and a hanger knob electrically connected to a second contact of the circuit board are provided on the back surface of the rear case of the microphone. When the hanger knob is hooked to the conductive microphone hanger, the microphone hanger is inserted between the hanger plate and the hanger knob, and the hanger plate and the hanger knob can be electrically connected through the hanger plate. The microphone can detect a locked state where the microphone is locked to the hanger knob and a detached state where the microphone is removed from the hanger knob based on conduction and disconnection between the hanger plate and the hanger knob.

Patent No. 3608849

However, in the structure described in Patent Document 1, the conductive component that communicates with the hanger plate is exposed on the outside of the case, so poor contact may occur due to friction, dirt due to dust, or rust. Additionally, false detection may occur if a metal such as a coin touches a conductive component.

The present invention has been made in view of the above problems, and an object thereof is to provide a microphone that can suppress poor contact and false detection.

According to a first aspect of one or more embodiments, in a microphone having a switch function that detects a locked state in which the microphone is locked to a holder and a detached state in which it is removed from the holder, the microphone is configured to detect a locked state and a detached state. A microphone is provided that includes a substrate provided with a detection circuit for detecting the detection circuit, a case accommodating the substrate, and a hook provided on the case and detachable from a holder. In this microphone, the hook is inserted into a fitting hole that passes through the inside and outside of the case, and has two parts: a rod part that switches the opening and closing of the detection circuit by moving forward and backward with respect to the board, and a rod part that is exposed outside the case. and a biasing member that biases the rod portion toward the substrate. In the locked state, the holder is sandwiched between the outer surface of the case and the flange, the hook is pulled out of the case, and the rod moves back from the board, opening and closing the detection circuit. Set to one of the states. In the detached state, there is no holder between the outer surface of the case and the flange part, and the hook is pulled into the inside of the case by the urging force of the urging member, and the rod part advances toward the board. Set the detection circuit to the other of the open and closed states.

According to the present invention, it is possible to suppress poor contact and false detection.

FIG. 1 is a front view showing a microphone according to this embodiment. FIG. 2 is a rear view of the microphone according to this embodiment. FIG. 3 is a side view showing the microphone according to this embodiment. FIG. 4 is a sectional view showing the II section of the microphone shown in FIG. FIG. 5 is a diagram illustrating a detection operation for detecting a locked state and a detached state. FIG. 6 is a diagram illustrating a detection operation for detecting a locked state and a detached state.

The microphone according to this embodiment will be described below with reference to FIGS. 1 to 4. This microphone is applied, for example, to a radio device installed in a vehicle. The microphone can be connected to the radio body via a cable 32. A holder 40 for locking a microphone is attached to a predetermined position inside the vehicle, such as an instrument panel.

The microphone has a switch function that detects a locked state in which the microphone is locked in the holder 40 and a detached state in which the microphone is removed from the holder 40. By detecting whether the holder 40 is locked or removed, the microphone can turn on or off a pre-assigned function. Assignment functions include an on-hook function that allows a direct call without pressing the PTT (Push to Talk) knob 6, and a scan function that scans for communicable channels.

The microphone is mainly composed of a case 1, a substrate 2, and a hook 10.

The case 1 is a housing that houses the board 2 therein, and is made of a material such as synthetic resin. The case 1 includes a front case 4 and a rear case 5, which face each other. The peripheral edge of the front case 4 and the peripheral edge of the rear case 5 correspond in shape. The rear case 5 is attached to the front case 4 such that the peripheral edge of the rear case 5 butts against the peripheral edge of the front case 4. The front case 4 and the rear case 5 are attached using fasteners such as screws, for example. The case 1 has a closed cross section with a space formed between a front case 4 and a rear case 5.

Front case 4 constitutes the front of case 1. When using the microphone, the front case 4 of the case 1 faces the user's mouth. The front case 4 is provided with a sound collection hole (not shown) that is composed of one or more holes that penetrate the inside and outside of the front case 4 . A board 2 is fixed to the back side of the front case 4 using screws 3. The front case 4 faces the front surface 2a of the board 2.

The rear case 5 constitutes the back surface of the case 1. The rear case 5 covers the back side 2b of the board 2. A fitting hole 5a, which is a through hole passing through the inside and outside of the rear case 5, is provided at the center of the rear case 5.

A PTT knob 6 is swingably provided on the side of the case 1 to switch between transmitting and receiving audio signals. This PTT knob 6 is always urged outward by a compression spring (not shown).

Various electronic components are mounted on the board 2, and the board 2 includes circuits that implement various functions required of the microphone. The board 2 is electrically connected to the main body of the radio via a cable 32.

The board 2 includes a sound collection circuit that collects the user's voice. The sound collection circuit includes an ECM (electret condenser microphone) unit (not shown). The ECM unit is provided on the front side 2a of the board 2, and is arranged at a position corresponding to the sound collection hole of the front case 4.

The substrate 2 includes a detection circuit that detects the holder 40. The detection circuit detects a locked state in which the microphone (specifically, the hook 10) is locked to the holder 40, and a detached state in which the microphone is removed from the holder 40. The detection circuit includes a switch 21. The switch 21 is provided on the back surface 2b side of the substrate 2, and is disposed at a position facing the fitting hole 5a.

The switch 21 constitutes a part of the detection circuit, and opens and closes this detection circuit. The switch 21 includes a movable element 21a that moves in response to pressure, and opens and closes a detection circuit in accordance with the operation of the movable element 21a. The switch 21 is, for example, an a-contact switch. That is, when the movable element 21a is pressed, a pair of contacts constituting a part of the detection circuit are brought into conduction, and the detection circuit is brought into a closed state. Conversely, when the pressure on the movable element 21a is released, the pair of contacts are cut off and the detection circuit is opened. Note that the switch 21 is not limited to an a-contact switch, but may be a b-contact switch or the like.

The board 2 includes a switching circuit that switches transmission and reception of audio signals in response to a pressing operation of a PTT (Push to Talk) knob 6. The switching circuit includes a PTT switch (not shown). The PTT switch is not normally pressed and is pressed only when the PTT knob 6 is pressed.

The hook 10 is provided in the case 1. The hook 10 is configured to be detachable from the holder 40. The microphone is locked to the holder 40 via the hook 10.

The hook 10 includes a rod portion 12, a flange portion 14, and a compression spring 16.

The rod portion 12 is a shaft body having a cylindrical shape. The rod portion 12 is inserted into the fitting hole 5a of the rear case 5 in a fitted state. The rod portion 12 is slidable along the axial direction, and can switch opening and closing of the detection circuit by moving forward and backward with respect to the substrate 2. Note that the rod portion 12 only needs to correspond to the opening shape of the fitting hole 5a, and does not necessarily have to have a cylindrical shape.

A first end 12a, which is one end of the rod portion 12, is located inside the case 1 with the rear case 5 as a boundary. The first end 12a faces a switch 21 mounted on the back surface 2b of the board 2. The second end 12b, which is the other end of the rod portion 12, is located outside the case 1 with the rear case 5 as a boundary.

A sealing member 13 is provided at the fitting portion between the rod portion 12 and the fitting hole 5a to seal between the case 1 and the rod portion 12 while ensuring slidability to the extent that the rod portion 12 can move forward and backward. is provided. For example, an O-ring can be used as the seal member 13.

The flange portion 14 is provided at the second end portion 12b of the rod portion 12 and is exposed to the outside of the case 1. The outer diameter of the flange portion 14 is wider than the outer diameter of the rod portion 12.

A facing surface 14a facing the rear case 5 in the flange portion 14 is formed in a tapered shape such that the wall thickness becomes thinner toward the outside in the radial direction. By forming the opposing surface 14a into a tapered shape, a gap can be provided between the opposing surface 14a and the rear case 5 without the entire area of the opposing surface 14a coming into surface contact with the rear case 5. When locking the hook 10 to the holder 40, the holder 40 can be inserted between the flange portion 14 and the rear case 5 due to this gap.

The compression spring 16 urges the rod portion 12 toward the substrate 2 side. The rod portion 12 is inserted into a hollow portion of a compression spring 16 wound into a coil, and the compression spring 16 is provided around the rod portion 12 . A groove portion is formed near the first end portion 12a of the rod portion 12 by cutting out a portion of the outer periphery of the rod portion 12.

A snap ring 15 is attached to the groove of the rod portion 12 so as to fit into the groove. The snap ring 15 has a function of preventing the compression spring 16 from falling off the rod portion 12. One end of the compression spring 16 is in contact with the snap ring 15, and the other end is in contact with the rear case 5. Thereby, the repulsive force of the compression spring 16 is transmitted as a biasing force that biases the rod portion 12 toward the substrate 2 side.

The holder 40 is, for example, a plate-like member having a desired shape. A U-shaped slit 41 for locking the hook 10 is formed in the holder 40. The slit 41 is formed linearly from the upper end of the holder 40 to the middle part so that the hook 10 can be inserted from above. The width of the slit 41 is set larger than the outer diameter of the rod portion 12 and smaller than the outer diameter of the flange portion 14.

The rod portion 12 is inserted into the slit 41 of the holder 40 from above the slit 41. When the slit 41 is inserted into the rod portion 12, the flange portion 14 is located on the back side of the holder 40. Thereby, the hook 10 is locked by the holder 40. On the other hand, since the upper part of the slit 41 is open, the hook 10 can be removed from the holder 40 by lifting the hook 10 upward along the slit 41.

The detection operation for detecting the locked state and removed state of the microphone will be described below. First, with reference to FIG. 5, a detached state in which the microphone is removed from the holder 40 will be described. In the detached state, the holder 40 does not exist between the outer surface of the rear case 5 and the flange portion 14. The hook 10 is drawn into the case 1 by the biasing force of the compression spring 16, and the rod portion 12 is in a state of being advanced toward the substrate 2.

In the state where the rod portion 12 is advanced, the first end portion 12a of the rod portion 12 comes into contact with the movable element 21a of the switch 21, thereby pressing the movable element 21a. When the movable element 21a is pressed, a pair of contacts constituting a part of the detection circuit are electrically connected to each other, and the detection circuit is in a closed state. By closing the detection circuit, the detection circuit detects the removal state. Then, by detecting the detached state, the detection circuit detects that the assigned function, for example, the on-hook function is turned off.

Next, with reference to FIG. 6, a locked state in which the microphone is locked to the holder 40 will be described. When locking the microphone to the holder 40, the hook 10 is locked to the holder 40. Specifically, the holder 40 is inserted into the gap between the outer surface of the rear case 5 and the flange portion 14 of the hook 10, and in addition, the rod portion 12 of the hook 10 is inserted into the slit 41 from above the slit 41. This locks the microphone to the holder 40.

In the locked state, the holder 40 is sandwiched between the outer surface of the rear case 5 and the flange portion 14. Therefore, depending on the thickness of the holder 40, the hook 10 is pulled out to the outside of the case 1, and the rod portion 12 is retreated from the substrate 2 by a predetermined distance. When the rod portion 12 retreats from the substrate 2, the first end 12a of the rod portion 12 separates from the movable element 21a, so that the pressure on the movable element 21a is released.

When the pressure on the movable element 21a is released, a pair of contacts forming a part of the detection circuit are cut off from each other, and the detection circuit is placed in an open state. When the detection circuit is opened, the detection circuit detects the locked state. Then, by detecting the locked state, the detection circuit detects turning on of the assigned function, for example, the on-hook function.

As described above, according to the microphone of this embodiment, the rod portion 12 inserted into the case 1 switches opening and closing of the detection circuit by moving forward and backward with respect to the substrate 2. The substrate 2 , the compression spring 16 that applies a biasing force to the rod portion 12 , and a portion of the rod portion 12 are present inside the case 1 . Therefore, the necessary components are protected inside the case 1, so that poor contact caused by the exposed outside of the case 1 can be suppressed. Moreover, since the necessary parts are protected inside the case 1, false detection can be suppressed.

In addition, since the conductive portion is not exposed to the outside of the case 1, waterproofness can be improved.

Furthermore, since the number of parts for opening and closing the detection circuit is small, the device can be simplified and costs can be reduced.

Furthermore, since the detection circuit is opened and closed through the forward and backward movement of the rod portion 12, the hook 10 and the holder 40 do not need to be made of conductive material. Thereby, the range of material selection can be expanded, and costs can be reduced at the same time.

Further, according to the microphone of this embodiment, the detection circuit includes the switch 21. Via this switch 21, the forward and backward movement of the rod portion 12 can be connected to the opening and closing of the detection circuit. Thereby, the locked state and the detached state can be appropriately detected.

In this embodiment, the detection circuit is opened and closed via the switch 21. However, the detection circuit may be opened and closed without using the switch 21. For example, a conductive member made of a conductive material such as metal may be provided at the first end 12a of the rod portion 12. The rod portion 12 advances toward the substrate 2 side, and the conductive members at the first end portion 12a contact the pair of contact points, respectively, so that conduction can be established between the pair of contact points. Conversely, when the rod portion 12 retreats from the substrate 2 and the conductive member at the first end 12a separates from the pair of contacts, the pair of contacts can be cut off. Thereby, the same function as when using the switch 21 can be obtained.

Furthermore, in the microphone of this embodiment, a sealing member 13 is provided at the fitting portion between the fitting hole 5a and the rod portion 12. Thereby, the airtightness of the case 1 can be improved, so that the waterproofness of the microphone can be improved.

In the embodiment described above, the compression spring 16 is used as the biasing member that biases the rod portion 12 toward the substrate 2 side. However, the biasing member is not limited to the compression spring 16. For example, a tension spring may be provided between the substrate 2 and the rod portion 12, and the rod portion 12 may be urged toward the substrate 2 by the tensile force of the tension spring.

The embodiment described in detail above is not limited to the above-mentioned configuration, and may be modified without departing from the gist of the present invention.

1 Case 2 Board 4 Front case 5 Rear case 5a Fitting hole 10 Hook 12 Rod portion 13 Seal member 14 Flange portion 16 Compression spring 21 Switch 21a Mover 40 Holder

Claims (3)

A microphone equipped with a switch function that detects a locked state in which it is locked in a holder and a detached state in which it is removed from the holder,
a board provided with a detection circuit that detects the locked state and the removed state;
a case accommodating the substrate;
a hook provided on the case and detachable from the holder;
has
The hook is
a rod part that is inserted into a fitting hole that penetrates the inside and outside of the case, and switches opening and closing of the detection circuit by moving forward and backward with respect to the board;
a flange portion exposed outside the case and provided at an end of the rod portion;
a biasing member that biases the rod portion toward the substrate;
has
In the case of the locked state, the holder is sandwiched between the outer surface of the case and the flange portion, so that the hook is pulled out to the outside of the case, and the rod portion retreats from the substrate. Set the detection circuit to one of the open state and the closed state,
In the detached state, the holder does not exist between the outer surface of the case and the flange portion, and the hook is drawn into the inside of the case by the biasing force of the biasing member, and the rod portion The microphone is characterized in that the detection circuit is set to the other of an open state and a closed state by advancing toward the substrate. The detection circuit includes:
comprising a switch that opens and closes the detection circuit according to the operation of the movable element that moves in response to pressure;
When the rod portion advances toward the substrate, the rod portion comes into contact with the movable element, thereby pressing the movable element,
The microphone according to claim 1, wherein when the rod part retreats from the substrate, the rod part separates from the movable element, thereby releasing the pressure on the movable element. The microphone according to claim 1 or 2, wherein a sealing member is provided at a fitting portion between the fitting hole and the rod portion.

Images