KR20010094480A - Subminiature acoustic oscillator having an improved impact resistance - Google Patents

Abstract

PURPOSE: A small-sized sound vibrator strengthening shockproof characteristic is provided to simplify a structure of a sound vibrator by fixing a voice coil to a base plate and using a fixing rivet to form a magnet circuit. CONSTITUTION: A small-sized sound vibrator has a cylinder shape. A frame(12) forms a sidewall of the small-sized sound vibrator. A base plate(14) is combined with an inner side of the frame(12). An electrode terminal plate(11) is formed on an outer face of the base plate(14). One end of a coil(13) is fixed to the electrode terminal plate(11). The coil(13) is extended to an inside of small-sized sound vibrator through the base plate(14). The other end of the coil(13) is connected with the lower end of a voice coil(30). The voice coil(30) induces magnetic field from a voice signal when an external power supply source supplies an electric power to the voice coil(30) through the electrode terminal plate(11) and the coil(13). A center passing hole(15) is formed to control a frequency response characteristic of the small-sized sound vibrator. A concavo-convex portion(17) is formed at the lower end of the base plate(14). A protector(40) is formed on an upper portion of the frame(12). An aperture(41) is formed at a center of the protector(40). A fixing rivet(50) is inserted into the aperture(41).

Description

Subminiature acoustic oscillator having an improved impact resistance

The present invention relates to a micro-acoustic vibrator, and more particularly, by directly vibrating the human head bones to stimulate the auditory nerve through the bone bone to listen to the sound, the communication security is securely maintained, and the vibration response characteristics It relates to a very small acoustic oscillator which is fast and particularly resistant to shocks.

Recently, a goldo phone has been developed that allows people with hearing impairments, such as deaf or elderly, to talk like normal people. The bone conduction phone allows the elderly with hearing impairment to use the bone conduction hearing in their ears to talk like a normal person without using external aids such as hearing aids. Whereas ordinary telephones convert electrical signals into acoustic signals through a handcuff consisting of speakers, the telephones are called “goldo hearing” in which the hearing impaired in the outer and middle ear can hear the bones around the forearm. It uses unfamiliar medical principles. When using the bones of hearing, it is said that it is effective for blocking the noise of the surroundings, so it is excellent not only for the telephone call for the hearing loss but also for the telephone call of normal people in the noise environment such as the market and the construction site.

Korean Patent Application No. 99-9802, filed by the applicant of March 23, 1999, discloses an ultra-small bone conduction speaker that is extremely compact, economically secured in communication, and simple in structure. The bone conduction speaker fixes the voice coil to the base plate, constitutes a magnetic circuit capable of vertical vibration with yoke, magnet and O-shaped ring, and transmits acoustic vibration to the outside of the top of the fixing rivet which fixes them together. A mastoid is provided.

However, since the damper is installed and supported only at the upper end of the yoke of the magnetic circuit, there is a problem that permanent deformation of internal components occurs in reliability tests such as external shock and drop test. In addition, the magnetization of the magnetic circuit is performed after the assembly is completed due to the characteristics of the speaker. In the conventional structure, the magnetic circuit part strongly hits the base plate by the ferromagnetic force generated during magnetization, causing permanent deformation of the voice coil or damper. there is a problem. In addition, since the magnetic circuit vibrates, the mass of the vibrometer is heavy, resulting in a slow vibration response speed for each frequency.

The present invention has been made to solve the conventional problems as described above, the object of the present invention, unlike the conventional bone conduction oscillator structure is to fix the voice coil to the base plate and integrate the mastoid, adapter and eyelet By installing a fixed rivet and constructing a magnetic circuit capable of vertical vibration with yoke, magnet and O (O) ring, the internal structure is simple and miniaturization can be applied for various purposes, and the initial position of the voice coil Since it is located outside the circuit and pushed into the magnetic circuit when it is in contact, it provides a small acoustic vibrator that has a small sound emission to the outside and thus secures communication security.

1 is a plan view of a micro acoustic vibrator according to a preferred embodiment of the present invention, and

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

<Explanation of symbols for main parts of drawing>

10: acoustic vibrator 11: electrode terminal plate

12 frame 14 base plate

14a: central support 14b: wrinkled film

15: Center through hole 17: Uneven portion for terminal attachment

20: damper 21: U-shaped wrinkled portion

22 yoke 24 magnet

26: O-shaped reel 30: voice coil

40: protector 41: opening

50: rivet 52: mastoid part

S: internal space G: spacing

In order to achieve the above object, the present invention,

A frame having a side wall and a base plate, the central support portion of which is formed at the center of the base plate to protrude upwards, and having a corrugation film disposed between the central support portion and the radially inner end portion of the lower wall;

A protector having an inner periphery bonded on an upper surface of the side wall and having an opening formed in the center thereof;

A damper having an outer end disposed between an upper end of the side wall and a lower surface of the inner peripheral part, the damper having a U-shaped corrugation part in the middle thereof;

A yoke positioned below the damper, the yoke having a main body portion for supporting an inner end of the damper and an extension part integrally formed with the main body portion and extending downward in a step shape;

An O-shaped ring disposed adjacent immediately inside the extension portion;

A magnet disposed on a radially inner side of the extension part and the O-shaped ring such that an upper surface is in close contact with a lower surface of the main body, and configured to form a magnetic circuit together with the yoke and the O-shaped ring;

Fixing means having an upper portion exposed to the outside through the opening directly contacting the head of the human body, integrally formed with the damper, for fixing the protector, the yoke and the magnet integrally; And

The micro-acoustic vibrator includes a voice coil disposed at an interval formed between the O-shaped ring and the inner surface of the extension part and both ends of the magnet, and having a lower end fixed to a radially inner upper end of the lower wall.

As described above, the acoustic vibrator according to the present invention forms a central support part in the center of the base plate, forms a corrugation film for suppressing the left and right flow of the magnetic circuit between the central support part and the base plate, and provides a damper and a fixed rivet. By forming integrally and additionally forming a U-shaped corrugation part to suppress the left and right flow of the magnetic circuit in the middle of the damper, it secures a stable support structure and prevents permanent deformation of the internal parts generated when landing. It guarantees the smooth up and down vibration of the circuit and improves the vibration response characteristics by reducing the mass of the vibration system.

Hereinafter, the micro-acoustic vibrator according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view of a micro acoustic vibrator according to a preferred embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line II-II of FIG.

1 and 2, the ultra-small acoustic vibrator 10 according to the preferred embodiment of the present invention has a cylindrical shape and includes a frame 12 forming sidewalls of the acoustic vibrator 10. The base plate 14 is fitted inside the open lower part of the frame 12. Alternatively, the lower wall of the frame 12 may be formed of the base plate 14.

On the bottom outer surface of the base plate 14, an electrode terminal plate 11 for receiving a current from an external power supply source (not shown) is formed, and one end of the coil 13 is soldered and fixed to the electrode terminal plate 11. The coil 13 extends beyond the base plate 14 into the interior of the acoustic vibrator 10, and the other end of the coil 13 thus extended is disposed at the radially inner end of the base plate 14 in the acoustic vibrator 10. It is connected to the bottom of the voice coil 30 is fixed to be upright. When a current is applied from the external power supply to the electrode terminal plate 11 so that a current is supplied from the electrode terminal plate 11 along the coil 13 to the voice coil 30, the voice coil 30 generates a magnetic field from the voice signal electrical energy. Induces a change.

A cylindrical hollow central support portion 14a is formed to protrude upward in the center of the base plate 14, and a wrinkled film 14b is disposed between the central support portion 14a and the radially inner end of the base plate 14. do. The central support portion 14a and the wrinkled film 14b are integrally formed with the base plate 14. A central through hole 15 is formed at the bottom of the central support 14a to adjust the frequency response characteristic of the acoustic vibrator 10.

On the basis of the center support part 14a, the terminal attachment concave-convex part 17 is disposed at the lower end of one side of the base plate 14 opposite to the installation position of the electrode terminal plate 11. The uneven portion 17 for attaching the terminal is provided for connection with an external device such as a microphone.

The disk-shaped protector 40 is detachably joined to the upper portion of the frame 12. In other words, the inner radial end of the protector 40 is bonded onto the top surface of the frame 12 by an adhesive. Alternatively, the inner radial end of the protector 40 may be joined to the top of the frame 12 by thermal fusion. A circular opening portion 41 is formed in the center of the protector 40, and the upper portion of the tubular fixing rivet 50 in which the conventional eyelet and the adapter are integrated is fitted and fixed to the opening portion 41.

At the top of the fixing rivet 50 is a mast portion 52 which is a vibration contact portion which is in direct contact with the head of the human body. The mastoid portion 52 has a shape that is smoothly curved with a constant curvature in consideration of contact with the head of the human body.

On the other hand, a stepped showr 12a is radially inwardly formed at the upper end of the frame 12, and an inner radial end of the protector 40 is seated on the shoulder 12a. As mentioned above, the inner radial end of the protector 40 is bonded onto the shoulder 12a of the frame 12 by an adhesive. Alternatively, the inner radial end of the protector 40 is joined on the shoulder 12a of the frame 12 by thermal fusion. Then, on the shoulder 12a of the frame 12, an outer end of the horizontal damper 20 is disposed between the inner radial end of the protector 40 and the upper surface of the frame 12.

The damper 20 is for reducing vibration or sound amplitude by dissipating energy, and is formed integrally with the fixed rivet 50. That is, the damper 20 extends horizontally outward from the outer surface of the fixed rivet 50, wherein the U-shaped wrinkled portion 21 is formed in the middle of the damper 20 is convex downward.

The yoke 22 and the magnet 24 are disposed together between the radial bottom surface of the damper 20 extending from the fixed rivet 50 and the top surface of the central support portion 14a of the base plate 14.

The yoke 22 is a case for concentrating magnetic flux in the acoustic vibrator 10 and is made of cast iron or cast steel. The yoke 22 is located in the interior space S defined by the base plate 14, the frame 12, and the damper 20. In the internal space S, the yoke 22 is formed integrally with the main body portion 22a and the main body portion 22a, in which a through hole (not shown) through which the fixed rivet 50 passes, is formed in a stepped shape. And an extension portion 22b extending in the direction.

O-shaped ring 26 is disposed radially inward of extension 22b of yoke 22. And the magnet 24 is arrange | positioned in the radial inside of the extension part 22b and the O-shaped ring 26 in the lower part of the yoke 22. As shown in FIG. The magnet 24 is fixed by a fixing rivet 50 passing through the central portion of the magnet 24, wherein the upper surface of the magnet 24 is in close contact with the lower surface of the body portion 22a of the yoke 22 and the magnet The lower surface of 24 is in close contact with the upper surface of the central support 14a.

The magnet 24 and the O-shaped ring 26 together with the yoke 22 constitute a magnetic circuit. The voice coil 30 as described above is disposed in the gap G formed between the magnet 24 and the O-shaped ring 26.

Meanwhile, the dampers 20, the yokes 22, and the magnets 24, which are arranged vertically in the acoustic vibrator 10, are fixed to the joining holes (reference numerals omitted) formed through the centers thereof, respectively. The fixing rivet 50 is integrally fixed by press-fitting the fixing rivet 50 into the central supporting portion 14a so that the lower surface of the fixing rivet 50 contacts the inner surface of the central supporting portion 14a.

The operation of the ultra-acoustic vibrator 10 according to the present invention configured as described above will be described briefly.

If a current is applied to the electrode terminal plate 11 from an external power supply source and current is supplied from the electrode terminal plate 11 to the voice coil 30 along the coil 13, the voice coil 30 generates a voice signal electrical energy. Induce a change in the magnetic field. That is, when a current is applied to the voice coil 30, the voice coil 30 and the voice coil 30 are located within the gap G of the magnetic circuit composed of the O-shaped ring 26, the magnet 24, and the yoke 22. Fleming's left-hand law holds when a magnetic field is generated between them.

Then, in the state where the voice coil 13 is fixed, magnetic fields formed between the voice coil 30, the O-shaped ring 26, the magnet 24, and the yoke 22 mutually exert an attraction force and repulsive force on each other. The O-shaped ring 26, the magnet 24, and the yoke 22, which are integrally coupled magnetic circuits, vibrate up and down. At this time, the central support portion 14a supporting the upper and lower vibration shafts of the base plate 14 has a very stable support structure, thereby preventing permanent deformation of internal components occurring at the time of landing. By suppressing the left and right flow of the circuit to maintain a constant vertical vibration.

In addition, the damper 20 provided at the upper end of the yoke 22 suppresses free vibration of the magnetic circuit and maintains constant up and down vibration. In particular, the damper 20 has a U-shaped wrinkle portion 21. As a result, the up and down oscillation is smoothly performed, the left and right flows are suppressed, and the effect of improving the vibration response characteristics according to the mass reduction of the vibration system can be incidentally obtained.

The upper and lower vibrations are transmitted to the human head where the mastoid portion 52 has been contacted through the mastoid portion 52, which is the uppermost portion of the fixed rivet 50, and as a result, a vibration force for listening to the bone conduction sound is obtained. .

As mentioned above, the micro-acoustic vibrator 10 according to the preferred embodiment of the present invention, the magnetic circuit capable of vertical vibration with the yoke 22, the magnet 24 and the O-shaped ring 26 And a mastoid portion 52 for transmitting acoustic vibrations to the outside at the top of the fixing rivet 50 for fixing them together, and for absorbing the left and right flows of the magnetic circuit in the middle of the damper 20 ( U) is provided with a corrugated portion 21, and formed in the center of the base plate 14, a central support portion 14a for firmly supporting the up and down vibration shaft, between the base plate 14 and the central support portion 14a By additionally providing a wrinkled film 14b for buffering the flow of magnetic circuits, it is possible to prevent permanent deformation of internal components occurring at the time of landing. Vibration due to mass reduction of vibration system The effect of improving the response characteristic can be obtained.

The micro-acoustic vibrator 10 according to the present invention by directly vibrating the head bones forming the human skull to stimulate the auditory nerve through the bone bones so that not only normal people but also various hearing loss people can listen to the sound. In addition, it is possible to use a cell phone, a walkie-talkie, earring-type headphones, telephone, etc., which can not be applied to the existing bone conduction speaker because it can be miniaturized. In addition, there is a low sound emission to the outside, there is an effect that the communication security is securely maintained.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (4)

A frame having a side wall and a base plate, the central support portion of which is formed at the center of the base plate to protrude upwards, and having a corrugation film disposed between the central support portion and the radially inner end portion of the lower wall; A protector having an inner periphery bonded on an upper surface of the side wall and having an opening formed in the center thereof; A damper having an outer end disposed between an upper end of the side wall and a lower surface of the inner peripheral part, the damper having a U-shaped corrugation part in the middle thereof; A yoke positioned below the damper, the yoke having a main body portion for supporting an inner end of the damper and an extension part integrally formed with the main body portion and extending downward in a step shape; An O-shaped ring disposed adjacent immediately inside the extension portion; A magnet disposed on a radially inner side of the extension part and the O-shaped ring such that an upper surface is in close contact with a lower surface of the main body, and configured to form a magnetic circuit together with the yoke and the O-shaped ring; Fixing means having an upper portion exposed to the outside through the opening directly contacting the head of the human body, integrally formed with the damper, for fixing the protector, the yoke and the magnet integrally; And And a voice coil disposed at an interval formed between the O-shaped ring and the inner surface of the extension part and both ends of the magnet, and having a voice coil fixed at a lower end to a radially inner upper end of the lower wall. The terminal of claim 1, wherein the wrinkled film is integrally formed with the base plate and the central support part, and an electrode terminal for receiving current from an external power supply and a terminal for connection with an external device on the bottom outer surface of the base plate. An uneven portion for attaching is formed, and one end of the coil is soldered and fixed to the electrode terminal, and the coil extends through the base plate into the micro acoustic oscillator, and the other end of the coil is connected to the lower end of the voice coil. Ultra-small acoustic vibrator, characterized in that. The terminal of claim 2, wherein a center through hole is formed at a bottom of the center support to adjust the frequency response characteristic of the ultra-small acoustic oscillator, and the terminal attachment recess is formed at an installation position of the electrode terminal plate based on the center through hole. Miniature acoustic vibrator, characterized in that formed on the lower end of the radially opposite side of the base plate. According to claim 3, wherein the protector, the yoke and the magnet disposed in the vertically in the micro-acoustic vibrator passes through the fixing means formed through the center thereof, respectively, the lower end of the fixing means The fixing means is integrally fixed by press-fitting the fixing means into the central support portion 14a so as to contact the inner surface of the central support portion 14a, and a current is applied from the external power supply to the electrode terminal so that the voice is along the coil. When a current is applied to the coil, in a state where the voice coil is fixed, magnetic fields formed between the voice coil, the O-shaped ring, the magnet, and the yoke exert an attraction force and a repulsive force on each other so that the magnetic The circuit vibrates up and down, and the damper suppresses free vibration of the magnetic circuit so that a constant phase It maintains the vibration, the vibration is very small acoustic transducer, characterized in that passed to the human hair portion and the vibrating contact portion that is in contact through the vibration contact portion of the fixing means.