KR200200502Y1 - Subminiature acoustic oscillator having an improved impact resistance - Google Patents

Abstract

By vibrating a person's head bone directly, it stimulates the auditory nerve through the bones to listen to sound. It can be miniaturized to be used for mobile phones, walkie-talkies, ear-phones, and telephones. In addition, a small acoustic oscillator is disclosed which has a fast vibration response and is particularly resistant to impact. According to the present invention, the voice coil is fixed to the base plate and constitutes a magnetic circuit capable of vertical vibration with a yoke, a magnet and a ergonomic ring, and for transmitting acoustic vibrations to the outside on top of a fixing rivet that fixes them together. A mastoid part is provided. The damper for reducing vibration or sound amplitude is formed integrally with the fixed rivet, and a U-shaped corrugation portion for suppressing the left and right flow of the magnetic circuit is formed in the middle of the damper. In addition, the center of the base plate is formed with a cylindrical central support for firmly supporting the vertical oscillation axis, and further formed a wrinkle film between the central support and the base plate. Due to this structure, the micro-acoustic vibrator according to the present invention is resistant to impact and exhibits a quick vibration response.

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 bones to listen to the sound, the communication security is maintained securely, 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 impairments to use the bone conduction in the ear 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 ear and middle ear can hear the bones around the forearm. It uses unfamiliar medical principles. When using Bonedo hearing, it has the effect of blocking the surrounding noise, so it is evaluated that 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 compact bone conduction speaker that is extremely compact, economically secured, and has a simple internal structure. This bonedo speaker looks The mast coil is fixed to the base plate, and a yoke, a magnet, and an O-shaped ring form a magnetic circuit capable of vertical vibration, and a mastoid for transmitting acoustic vibration to the outside at the top of the fixing rivet that fixes them together. Equipped.

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 is devised to solve the conventional problems as described above, the object of the present invention, unlike the conventional bone conduction vibrator structure 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-shaped 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,

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

<Explanation of symbols for the main parts of the drawings>

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 shape wrinkles

22 yoke 24 magnet

26: O-shaped ring 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, wherein a central cylindrical portion of a hollow cylindrical shape protrudes upward in a central position of the base plate, and a wrinkled film is disposed between the central support portion and a 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

Between the inner surface of the O-shaped ring and the extension and both ends of the magnet. Is arranged in the gap, and provides a micro acoustic vibrator including a voice coil fixed to the lower end on the radially inner top of the lower wall.

As described above, the acoustic oscillator 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, with reference to the accompanying drawings will be described in more detail the micro-acoustic vibrator according to the present invention as follows.

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 portion of the frame 12. However, in some cases, 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 from an external power supply (not shown) An electrode terminal plate 11 for receiving a current is formed, and one end of the coil 13 is soldered and fixed to the electrode terminal plate 11. The coil 13 extends through the base plate 14 and 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 lower end of the voice coil 30 fixed to be upright.

In the above state, when 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 is negative. Induce change of magnetic field from signal electric energy.

A cylindrical hollow central support portion 14a protrudes upward in the center of the base plate 14, and a wrinkled film 14b is formed between the central support portion 14a and the radially inner end of the base plate 14. Is placed.

In addition, the central support portion 14a and the wrinkled film 14b are formed integrally 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 portion 14a, a terminal attachment concave-convex portion 17 is disposed at a radially lower end 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. That is, the protector 40 has an inner radial end at the top of the frame 12 by an adhesive. Bonded on face. 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 41 is formed in the center of the protector 40, and an upper portion of a tubular fixing rivet 50 in which a conventional eyelet and an adapter are integrated is fitted into the opening 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 shoulder 12a is radially inwardly formed at the upper end of the frame 12, and the 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.

And, 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 In the middle of the damper 20 is a corrugated portion 21 having a U-shaped 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 mover 10 and is made of cast iron or cast steel. The yoke 22 is located in the internal 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, through which the fixing rivets 50 pass, and formed with a through hole (not shown). And an extension portion 22b extending in the &quot;

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 micro-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 vertical vibration is smoothly performed, and 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 obtained incidentally.

The upper and lower vibrations are transmitted to the head of the person with whom 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. Lose.

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 rivets 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 parts occurring at the time of landing, and to maintain a constant vertical vibration by suppressing the flow of magnetic circuits left and right. Due to mass reduction of vibration system It can be obtained the effect that the response characteristic is improved.

The micro-acoustic vibrator 10 according to the present invention by directly vibrating the head bones that form the human skull to stimulate the auditory nerve through the bone bone so that not only normal people but also various hearing loss people can hear 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 to the spirit and scope of the present invention described in the claims below It will be understood that various modifications and changes can be made in the present invention without departing from the scope thereof.

Claims (4)

A frame having a side wall and a base plate, wherein a central cylindrical portion of a hollow cylindrical shape protrudes upward in a central position of the base plate, and a pleat film is disposed between the central support portion and a radially inner end portion of the lower wall; A protector having an inner periphery bonded on an upper surface of the sidewall 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 periphery, and having a corrugated portion having a U shape in the middle thereof; A yoke positioned below the damper, the yoke having a main body portion 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 to the inner side of the extension portion; A magnet disposed on a radially inner side of the extension portion and the O-shaped ring such that an upper surface thereof is in close contact with a lower surface of the main body, and a magnet constituting a magnetic circuit together with the yoke and the O-shaped ring; A vibrating contact portion directly contacting the head of the human body on the upper portion exposed to the outside through the opening, and integrally formed with the damper, and fixing means for integrally fixing the protector, the yoke and the magnet; ; And Between the inner surface of the O-shaped ring and the extension and both ends of the magnet. Is arranged at intervals, the micro-acoustic vibrator, characterized in that consisting of a voice coil is fixed to the upper end of the radially inner side of the lower wall. The terminal of claim 1, wherein the corrugation film is integrally formed with the base tube and the central support portion, 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 bottom of the center support portion is formed with a central through hole for adjusting the frequency response characteristics of the ultra-small acoustic vibrator, the uneven portion for attaching the terminal to the installation position of the electrode terminal plate on the basis of 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, 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 middle ground When the fixing means is integrally fixed by pressing the fixing means into the central support portion so as to contact the inner surface of the branch, when a current is applied from the external power supply source to the electrode terminal, the current is applied to the voice coil along the coil. In the state in which the voice coil is fixed, magnetic fields formed between the voice coil, the O-shaped ring, the magnet, and the yoke exert an attractive force and repulsive force on each other to cause the magnetic circuit to vibrate up and down. The damper suppresses free vibration of the magnetic circuit to maintain a constant up and down vibration, and the vibration is transmitted to the head of a human being in contact with the vibration contact portion through the vibration contact portion of the fixing means. Micro-acoustic vibrator made.