JP4942805B2 - Microphone arm rotation mechanism for headset - Google Patents

Description

  The present invention relates to a rotation mechanism of a microphone arm in a headset in which a microphone is rotatably attached to a receiver.

  Conventionally, this type of microphone arm rotation mechanism is generally composed of parts including a spring made of metal or resin, and a structure in which a braking force is applied to the microphone arm on the rotation side by the pressing force of the spring is used. . For example, a gear-like unevenness is provided on the inner peripheral surface of the annular receiver, and a click member by a metal plate spring provided on the outer peripheral surface of the rotating annular body to which the microphone arm is attached is engaged with this unevenness, A spring braking force acting in the radial direction is applied to the rotating annular body by the spring force of the click member when passing (see Patent Document 1).

Japanese Utility Model Publication No. 7-33092

  When spring force is used as braking force against rotation, there is a difference in the engagement force between the convex part and the spring click part depending on the rotation angle, a partial difference occurs in the braking force, and the microphone arm angle and position are unstable. become. In addition, the spring is worn due to repeated engagement friction between the spring and the convex portion, and the spring force is reduced so that the initial braking force cannot be maintained.

  Further, when a weak braking force is required as a use condition, it is difficult to stably set an appropriate braking force by controlling the spring force with a configuration using a spring.

  Furthermore, the related components necessary for fixing the spring member require consideration of sufficient strength in the direction of the repulsive force of the spring, which is their mounting direction, and the direction of rotation of the microphone arm. The structure for obtaining the strength that can be competing has been a major obstacle to the reduction in size, weight, and durability of related components.

  The present invention has been proposed in view of the above, and the purpose of the present invention is to stabilize the braking force to the rotation of the microphone arm relative to the headset at all rotation angles and to stabilize the initial braking force over a long period of time. It is possible to provide a microphone arm rotating mechanism for a headset that can be maintained at the same time and that can set a desired appropriate braking force, and that can reduce the size and weight of related components and improve durability.

According to the first aspect of the present invention, there is provided a microphone arm rotation mechanism for a headset in which a base end portion of a microphone arm is rotatably attached to an outer surface of a housing of a headset receiver. Between the cap and the housing , there is provided a rotation and braking means formed by magnetic coupling between a magnet and a magnetic body, and this rotation and braking means has a cylindrical portion D1 that is rotatably fitted to the housing A. The arm cap D having the microphone arm MA, the annular magnet B fixed to the arm holder AH side provided in the housing, the annular magnet B is disposed opposite to the annular magnet B, and is rotatable with respect to the annular magnet B. A pole piece C made of a magnetic material attached to the arm cap D side and an arm piece D attached to the arm cap D side Characterized in that it comprises a rotor plate E which rotates together with the pole piece C by the rotation of Mukyappu D.
According to a second aspect of the present invention, in the microphone arm rotating mechanism for a headset according to the first aspect , the housing A includes an arm holder AH having a lower stage 1 defining a central circular opening and an upper stage 2 positioned higher than the lower stage. The annular magnet B is fixed to the upper surface of the lower stage 1, the arm cap D is formed on the outer peripheral surface of the arm holder AH, and a pair of bosses 3 formed on the arm cap D are formed in the central circular opening of the lower stage 1. The disc-shaped rotor plate E is inserted into the disc, and is rotatably fitted, inserted into the pair of bosses 3 and placed on the annular magnet B with a disc-shaped magnetic pole piece C. The central disk portion E1 is fixed to the boss 3 by screws 4 placed on the top surfaces of the pair of bosses 3 and screwed into the bosses 3 through the screw holes E2, and the outer peripheral portion E3 is attached to the arm holder. The rotor plate E is mounted in contact with the upper surface of the upper stage 2 of the AH, and the rotational force about the central axis O between the two axes of the pair of bosses 3 of the arm cap D is applied to the microphone arm MA. The arm cap D rotates the pair of bosses 3 together with the pole piece C and the rotor plate E around the central axis O within the opening B1 of the annular magnet B, and the annular magnet B Causes the magnetic force applied to the pole piece C to act as a braking force, and the rotor plate E has a braking force against rotation due to the pressure contact placement of the outer peripheral portion E3 on the upper stage 2 of the arm holder AH. It is characterized in that it can be adjusted by the tightening force.
According to a third aspect of the present invention, in the microphone arm rotating mechanism for a headset according to the first or second aspect, the outer peripheral portion E3 of the rotor plate E is substantially equidistant from the outer peripheral surface of the central disk portion E1 and has the same size. And a plurality of fins extending at the same time, and the braking force is enhanced by friction generated between the arm holder upper stage 2 and the fins during rotation.
According to a fourth aspect of the present invention, in the microphone arm rotating mechanism for the headset according to any one of the first to third aspects, the annular magnet B and the pole piece C are provided so as to obtain a desired magnetic braking force. In addition, a sheet made of a magnetically permeable material having magnetic permeability determined by selecting a thickness is inserted.

  According to the present invention, in order to obtain a braking force for fixing the rotational position of the microphone arm with respect to the receiver to a desired position, a magnet and a magnetic material are used instead of the conventionally used structure for obtaining the braking force by the pressing force of the spring member. By using the magnetic attractive force and frictional force between them as the braking force, the structure can be simplified, lighter and smaller, and the related structural parts compared to those using conventional spring members It is also possible to reduce the strength of the motor, and it is excellent in durability, and the initial braking force can be stably maintained for a long time.

The perspective view of a headset provided with the microphone arm rotation mechanism for headsets by this invention. FIG. 2 is a partially enlarged perspective view of an arm cap that forms a base of a microphone arm of the headset of FIG. 1. Sectional drawing of the microphone arm rotation mechanism for headsets by this invention shown along the I-I 'line of FIG. The perspective view of the rotor board used for the microphone arm rotation mechanism for headsets of FIG. The perspective view of the pole piece used for the microphone arm rotation mechanism for headsets of FIG. The perspective view of the annular magnet used for the microphone arm rotation mechanism for headsets of FIG.

  In the following, the arm cap that forms the base of the microphone arm for the headset is rotatably held with respect to the receiver housing, and at the same time, a rotation mechanism using magnetic force is provided as a braking force means for stably stopping at a desired rotation position. Examples of the present invention will be described.

  FIG. 1 is a perspective view of a headset HS of the present invention, and FIG. 2 is an enlarged perspective view of a receiver portion to which a base portion of a microphone arm is attached. The headset HS has an inverted U-shape and is made of an elastic member and can be attached to the head. A headband HB, a pair of receivers R respectively attached to both ends of the headband HB, and one of these. And a microphone arm MA having an arm cap D attached to a housing A of the receiver R.

  As is well known, the receiver R incorporates a driver unit (not shown) made of a diaphragm, a magnetic circuit, or the like. An ear pad E made of a donut-like elastic member is provided on the inner periphery of the receiver R. The main body of the microphone arm MA is made of a thin and thin plate-like member, and a microphone (not shown) is built in the tip. The base of the microphone arm MA is connected to an arm cap D, and the arm cap D is rotatably attached to the outer surface of the housing A of the receiver R. In the state shown in FIG. 1, when using the microphone with the headband HB widened, the headset HS on the head, and the receiver R set on the wearer's left ear, the microphone arm MA should be pointed As shown in Fig. 4, it is only necessary to rotate and bring the tip end with the built-in microphone closer to the mouth. When it is unnecessary and obstructive, you can rotate it in the opposite direction and move it away.

  FIG. 3 is a cross-sectional view of the housing A and the arm cap D and shows the rotation mechanism of the microphone arm MA. The inner peripheral portion of the housing A is formed in a step shape on the inner side and the outer side, and an arm holder AH for attaching the arm cap D is formed. This arm holder AH is formed in a short cylindrical shape. In the state shown in the figure, the arm holder AH has a lower step 1 that is inward at the lower end opening and a flange-like lower step 1 and an upper step 2 that is outward at the upper end. A cylindrical portion D1 formed on the inner surface side of the arm cap D is fitted so as to be rotatable along the outer peripheral wall surface. The inner surface of the arm cap D includes a pair of cylindrical bosses 3 standing upright at two points equidistant from the center on the diameter line continuous with the axis of the microphone arm MA. The height of these bosses 3 having screw holes along the axis of the boss 3 is such that when the arm cap D is rotatably attached to the arm holder AH of the housing A, the top surface of the boss 3 is slightly higher than the upper stage 2, for example It is set to be lower by about 0.5 to 1.0 mm. The reason for lowering will be described later.

  In this state, the annular magnet B shown in FIG. 6 is placed on the inner surface of the lower stage 1 inside the arm holder AH, and is preferably fixed to the lower stage 1 with an adhesive. The central opening B1 of the annular magnet B has a diameter that leaves a sufficient gap with respect to the outer periphery of the pair of bosses 3. Next, as shown in FIG. 5, a pole piece (a metal part made of a magnetic material) C made of a disk-shaped magnetic body having a pair of boss holes C1 formed at a size and a position for allowing the pair of bosses 3 to pass therethrough, It is allowed to pass and is placed on the annular magnet B. A hole H through which a microphone cord (not shown) is inserted is formed at the center of the pole piece C. Next, as shown in FIG. 4, a rotor plate E having a pair of screw holes E2 in the center disk portion E1 having the same position and size as the screw receiving holes of the boss 3 is placed on the top surface of the boss 3, and the outer peripheral portion E3 is armed. It is placed on the holder AH, the screw 4 is screwed into the screw receiving hole of the boss 3, and the central disk portion E 1 is attached to the top surface of the boss 3. Preferably, the pole piece C is pressed against the annular magnet B through the protrusion E4 by this screw tightening. Further, since the top surface of the boss 3 is slightly lower than the height of the upper stage 2, the tightening of the screw 4 to the boss 3 causes the outer peripheral portion E <b> 3 of the rotor plate E to be bent, and this pressure contact force Can be adjusted easily and arbitrarily according to the degree of tightening. A hole H for inserting a microphone cord (not shown) is also formed at the center of the rotor plate E.

  In the above configuration, the rotor plate E attached to the boss 3 via the screw 4, the pole piece C attached to the boss 3 with the upper surface in contact with the protrusion E 4 on the lower side of the outer peripheral portion of the central disk E 1 of the rotor plate E. The arm cap D having the microphone arm MA integrated with the rotor plate E and the pole piece C via the boss 3 functions as a rotating member.

  For the rotating member, the housing A and the annular magnet B in the housing A function as a so-called stationary member (stationary member).

  Next, the operation will be described. When a rotational force such as rotating the microphone arm MA by hand is applied, the rotational force is transmitted to the arm cap D, and the arm cap D has the inner wall surface of the cylindrical portion D1 around the central axis O as an arm holder. It slides and rotates with respect to the outer peripheral surface. Accordingly, the pair of bosses 3 rotate around the central axis O in the opening B1 of the annular magnet B, and simultaneously rotate the pole piece C and the rotor plate E. Since the rotation of the pole piece C is performed against the magnetic attractive force of the ring-shaped magnet B contacting the surface, and the rotation of the rotor plate E is performed against the frictional force caused by the press contact with the upper stage 2 of the arm holder AH. These magnetic attractive force and frictional force act as braking force against rotation.

  The rotation direction and range can be freely rotated in an arbitrary range in the clockwise direction and the counterclockwise direction. However, in order to prevent the cord connected to the microphone from being disconnected due to twisting, for example, the cylindrical portion D1 and the arm holder A stopper means (not shown) having an appropriate structure is provided at an appropriate position between the outer peripheral wall surfaces of the AH, the rotation range of the arm cap D is set to 270 degrees, and the position of the microphone arm MA is + from the central position overlapping the headband HB. , -135 degrees is preferable. By doing so, the microphone arm MA can be used even if the pair of receivers R are reversed and attached to the head. As the stopper means, for example, a locking portion (not shown) is formed on the inner surface of the rotatable arm cap D, and the locking for restricting the rotation range of the arm cap D corresponding to this locking portion. What is necessary is just to form a part in arm holder AH.

  As described above, in the present invention, between the stationary member of the housing A of the outer shell of the receiver main body and the arm cap D that is the rotation side member of the microphone arm base end, the magnet and the magnetic body that are surface-bonded to each other It consists of magnetic coupling. In the present embodiment, both the magnetic attractive force and the frictional force are used as the braking force, but may depend only on the magnetic attractive force. In this case as well, the rotor plate is necessary as a means for preventing the arm cap D from coming off from the arm holder AH. However, in the non-rotating configuration, the connection configuration with the pair of rotating bosses 3 must be taken into consideration. Also, instead of the pair of bosses 3, a bearing means is required to make a single rotating shaft. In this sense, the combined use of the frictional force and the magnetic attraction force is advantageous. The pair of bosses can be three or more.

  In the illustrated embodiment, the rotor plate E is formed with a plurality of fins extending radially from the outer peripheral surface of the central disk portion E1 at substantially equal intervals and the same size. This is to improve the frictional force with the surface of the upper stage 2 where the outer peripheral portion E3 is pressed, that is, the braking force against the rotation of the rotor plate E.

  On the other hand, the braking force due to the magnetic attractive force is basically determined by the magnetic characteristics of the materials selected as the magnet B and the pole piece C to be used, but if further fine adjustment of the magnetic force is necessary, for example, depending on the thickness By appropriately selecting a sheet (not shown) of a magnetically permeable material having a different magnetic permeability and placing it between the annular magnet B and the pole piece C, the magnetic force can be finely adjusted stably.

HS Headset HB Headband R Receiver E Earpad MA Microphone arm AH Arm holder A Housing B Ring magnet B1 Opening C Pole piece C1 Boss hole D Arm cap D1 Cylindrical part E Rotor plate E1 Central disk part E2 Screw hole E3 Outer part E4 Protrusion H Cord insertion hole 1 Lower 2 Upper 3 Boss 4 Screw

Claims (4)

In a microphone arm rotation mechanism for a headset that rotatably attaches a base end portion of a microphone arm to the outer surface of a housing of a headset receiver, between the arm cap that is a rotation side member of the microphone arm base end and the housing , A rotation / braking means provided by a magnetic coupling between a magnet and a magnetic body is provided. The rotation / braking means has a cylindrical portion (D1) that is rotatably fitted to the housing (A), and a microphone arm ( An arm cap (D) having an MA), an annular magnet (B) fixed to the arm holder (AH) provided in the housing, and an annular magnet (B) disposed opposite to the annular magnet (B). ) And a pole piece (C) made of a magnetic material attached to the arm cap (D) side, and the arm cap (D) Attached to the side arm caps (D) a headset microphone arm rotating mechanism which comprises a rotor plate (E) which rotates together with the pole piece (C) by the rotation of the. The microphone arm rotating mechanism for a headset according to claim 1, wherein the housing (A) includes an arm holder (AH) having a lower stage (1) defining a central circular opening and an upper stage (2) positioned higher than the lower stage. The annular magnet (B) is fixed to the upper surface of the lower stage (1),
On the outer peripheral surface of the arm holder (AH), the arm cap (D) and a pair of bosses (3) formed on the arm cap (D) are inserted into the central circular opening of the lower stage (1). The disc-shaped rotor plate (E) is fitted so that the pole piece (C) of the disc-like magnetic body is placed on the annular magnet (B) through the pair of bosses (3). Is placed on the top surfaces of the pair of bosses (3), and the central disk part (E1) is screwed into the bosses (3) via the screw holes (E2). ) And the outer peripheral part (E3) is brought into contact with the upper surface of the upper stage (2) of the arm holder (AH) to attach the rotor plate (E),
When a rotational force is applied to the microphone arm (MA) about the central axis (O) between the axes of the pair of bosses (3) of the arm cap (D), the arm cap (D) The pair of bosses (3) together with the pole piece (C) and the rotor plate (E) are rotated around the central axis (O) in the opening (B1) of the annular magnet (B), The annular magnet (B) causes the magnetic force on the pole piece (C) to act as a braking force, and the rotor plate (E) is pressed against the upper stage (2) of the arm holder (AH) of the outer peripheral part (E3). A microphone arm rotating mechanism for a headset, characterized in that a braking force against rotation caused by the mounting can be adjusted by a tightening force of a screw (4) with respect to the boss (3) . The microphone arm rotating mechanism for a headset according to claim 1 or 2, wherein the outer peripheral portion (E3) of the rotor plate (E) is radially equidistant from the outer peripheral surface of the central disk portion (E1) and has the same size. A microphone arm rotating mechanism for a headset , comprising: a plurality of extending fins, wherein braking force is enhanced by friction generated between the upper arm holder (2) and the fins during rotation. In the microphone arm rotation mechanism for headsets in any one of Claims 1-3 , thickness is provided between the said annular magnet (B) and the said pole piece (C) so that desired magnetic braking force may be obtained. A microphone arm rotating mechanism for a headset , wherein a sheet made of a magnetically permeable material determined by selecting a thickness is inserted .

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