KR100272048B1 - Electro-magnetic sound transducer. - Google Patents

Abstract

PURPOSE: A transducer is provided to remove unnecessary components by a semicircular base plate with a stickily formed integral with upper and lower housings, a coil wound around the stick, a permanent magnet and a magnet plate. CONSTITUTION: A upper housing(10) has holes(11) for outputting tone. A magnet plate(12) made of ferro-magnetic material is installed in the uppermost end of the upper housing(10). A diaphragm(14) is installed under the magnet plate(12) to convert a current signal to a sound signal. A permanent magnet(18) is installed under the diaphragm(14) to generated a magnetic force. A coil(16) is wound within the permanent magnet(18). The coil(16) is wound around a stick(22). The stick(22) is integrally fixed to a semi-circular base plate(20). The base plate(20) is fixed to a lower housing(24) coupled to the upper housing. Input and output terminals of the coil(16) are connected to terminals(30,30a) through the lower housing(24).

Description

Beeper

The present invention relates to a tone generator (or buzzer, alert, ringer) for converting a current signal into a sound signal to generate a tone. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal sound generator for converting a current signal generated at a frequency of a predetermined magnitude from electronic and electrical equipment (especially a mobile communication terminal) into a sound signal and outputting the sound signal to the outside.

In general, a signal generator that vibrates a moving iron piece using an electromagnet is a kind of signal mechanism that makes a vibrating sound. In DC, a contact is combined with a movable iron piece, and the contact is broken by suction of an electromagnet, and the intermittent vibration is carried out like a messenger. In the case of alternating current, the moving iron piece is brought close to the electromagnet, and the iron piece vibrates at twice the power source frequency (100 Hz at 50 to 100 Hz and 120 Hz to 60 to 120) according to the alternating current. There are various voltages for direct current, alternating current, and direct current and alternating current, and they are used for signals such as bells and alarms. There is also a non-contact type special beep generator with a built-in transistor.

On the other hand, a speaker having a function similar to a beeper generator is a device that emits a change in current as a loud voice or a loudspeaker. Structurally, it is divided into a cone type that uses cone-shaped paper, plastic, and metal as a diaphragm to directly radiate sound waves from it, and a horn type that combines a horn to improve efficiency on the front surface of the diaphragm. In addition, there are dynamic magnetics, crystals, and capacitors when looking at the principle of operation.

Conventional sound generators in the separate perspective view of Figure 1, a case 1 is composed of an output tube that emits sound on one side, a magnet plate (2) installed on the top of the case 1 and composed of permalloy, and A diaphragm 3 for converting a current signal generated at a predetermined thickness into a negative signal at a lower end of the magnet plate 2, a ring 5 for supporting the diaphragm 3, and a lower end of the ring 5. A permanent magnet 4 installed in the permanent magnet 4 to generate a magnetic force of a predetermined size, a coil 7 wound around the permanent magnet 4 a predetermined number of times, a stick 6 wound around the coil 7, and A base plate 8 to which the stick 6 is fixed, a printed circuit board 9 attached to a lower end of the base plate 8 and connected to an input / output end of the coil 7, and the printed circuit board 9. ) Is composed of terminals (9a, 9b) connected to the input and output terminals of the coil (7).

In the conventional beep generator configured as described above, a circular base plate 8 and a printed circuit board 9 are formed, and terminals 9a and 9b and the base plate 8 and the printed circuit board 9 are respectively overlapped. In addition, in order to improve the precision for the vibration of the diaphragm 3, a ring 5 positioned and fixed to the lower end of the diaphragm 3 is attached. However, this ring 5 acts as a deterrent to lightening the overall weight of the tone generator.

As such, a beep generator used in a mobile communication terminal (for example, a pager, a mobile phone or a computer, etc.) is currently becoming smaller and lighter in size and weight. In other words, the components used according to the miniaturization and integration of the mobile communication terminal are also becoming smaller and lighter. Therefore, even in the case of the signal generator, the weight and the size thereof become smaller and the performance is required to be the same. Accordingly, in the case of the conventional sound generator, a ring for supporting the diaphragm due to the precision due to miniaturization is configured, so that the overall weight of the sound generator is limited.

In addition, since the base plate, the stick and the printed circuit board are integrally formed, the overall weight is increased, and the number of processes is increased by riveting separately after processing the stick and the base plate, respectively, and occur during press processing of the base plate. Barrel polishing is required to remove burrs.

As described above, the conventional sound generator generates a large number of parts, increases the number of processes during machining, increases the cost of the parts, and limits the weight and size.

In order to solve such a problem, the present invention has been made in order to reduce the number of parts and the number of processes, to achieve miniaturization and weight reduction, and to improve the function thereof to provide a signal generator.

In addition, the sound generator of the present invention is an object to enhance the structure and improve the characteristics of the parts to produce the best sound quality and volume.

1 is an exploded perspective view showing a conventional beep generator,

2 is a perspective view of a beep generator according to the present invention;

3 is an exploded perspective view of the beep generator according to the present invention;

4 is a cross-sectional view of the beep generator according to the present invention;

5 is a cross-sectional view of the upper case of the beep generator according to the present invention;

6 is a cross-sectional view of the lower case of the beep generator according to the present invention;

7 is a block diagram of a semi-circular base plate of the beep generator according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

10: upper case 11: hole

12: magnet plate 14: diaphragm

16: coil 18: permanent magnet

20: base plate 22: stick

24: lower case 26: groove

28: molten acid 30, 30a: terminal

32, 32a: dummy terminal

In order to achieve the above object, the present invention provides a beep generator, comprising: an upper case configured with a hole emitting sound on one side, a magnet plate installed at the top of the upper case and formed of permalloy, and a lower end of the magnet plate. A diaphragm for converting a current signal generated at a predetermined thickness into a negative signal, a permanent magnet installed at a lower end of the diaphragm to generate a magnetic force of a predetermined size, and a coil wound a predetermined number of times inside the permanent magnet; And a stick to which the coil is wound, a semi-circular base plate to which the stick is integrally fixed, a lower case to which the base plate is fixed and coupled to an upper case, and a terminal to which the input and output terminals of the coil are connected through the lower case. It is characterized by being included.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

Figure 2 is a perspective view of the beep generator according to the invention, Figure 3 is an exploded perspective view, Figure 4 is a cross-sectional view.

The upper case 10 has a hole 11 having a predetermined size for discharging the sound signal generated from the signal generator to the outside, and is formed in the shape of a polygon of square or more. The upper case 10 is a synthetic resin that is hardly deformed even at a high temperature (about 250 to 290 ° C) as an injection molding.

Magnet plate 12 is installed at the top of the upper case 10, the magnet plate 12 is a kind of metal core material is used permalloy (nickel 40 ~ 90% and alloy of iron), the permeability (透 磁 率) It has high hysteresis loss and small saturation magnetic flux density compared to silicon steel sheet.

The diaphragm 14 is installed at the lower end of the magnet plate 12, and is made of a thin circular metal plate. The diaphragm 14 converts the current signal generated from the coil 16 into a sound signal. The magnet plate 12 is smaller in diameter than the diaphragm 14 but has a larger thickness than the diaphragm 14 and is bonded to the diaphragm 14 by spot welding.

The permanent magnet 18 is a ferromagnetic material which is installed at the lower end of the diaphragm 14 to generate a magnetic force of a predetermined size, and is composed of an annular shape having a predetermined diameter.

The coil 16 is wound inside the permanent magnet 18 a predetermined number of times, and generates a magnetic field in a predetermined direction by a current applied from the terminals 30 and 30a connected to the coil 16.

The stick 22 is configured integrally with the semicircular base plate 20, and is a portion in which the coil 16 is wound. The stick 22 and the semi-circular base plate 20 are processed using an integrated mold without performing separate riveting.

The lower case 24 is a portion in which the base plate 20 is fixed and coupled to the upper case 10. The lower case 24 is the same injection molding as the upper case 10, even at a high temperature (about 250 to 290 ° C.). Synthetic resins that do not deform well are used.

The terminals 30 and 30a are connected to the input and output terminals of the coil 16 through the lower case 24, respectively, and are integrally formed by insert injection molding with the lower case 24. The terminals 30 and 30a are cut to a predetermined length after injection molding and are bent and fixed to the side walls of the lower case 24.

In addition, the fixing dummy terminals 32 and 32a, which are inserted at the time of ejection of the lower case 24 and are fixed to the substrate of the mobile communication terminal on which the beep generator is mounted, are opposite to the terminals 30 and 30a to which the input / output terminals are connected. Each is formed and bent. That is, the lower case 24 is injection molded by inserting two dummy terminals 32 and 32a for fixing the beep generator and two terminals 30 and 30a connected to the input / output terminals, respectively.

In addition, the diaphragm 14 to which the magnet plate 12 is attached is located in the space between the uppermost end of the lower case 24 and the plurality of protrusions 29 and 29a formed in the upper case 10 to cause vibration. It is.

In addition, the semi-circular base plate 20 is fixed to the coil 16 and the permanent magnet 18 is attached to the adhesive, the adhesive used in the sound generator can withstand a predetermined temperature range (-45 ~ +250 ℃) The one excellent in cold resistance and heat resistance is used, and the high temperature (295 degreeC) is used for the soldering lead for connecting a coil to the terminals 30 and 30a. In addition, the permanent magnet 18 is used for high temperature (for example, high temperature Nd Bond Magnet), especially at the point where the surface Gauss (unit of magnetic flux density) is the smallest at high temperature potato (感 磁) It magnetizes.

On the other hand, in the cross-sectional view of the upper case of Figure 5, the upper case 10 is formed with a fusion fusion 28 of a predetermined size in order to increase the bonding strength by ultrasonic bonding on the surface coupled to the lower case 24. .

In addition, in the cross-sectional view of the lower case of Figure 6, the lower case 24 is formed with a groove 26 on the inner periphery to which the semi-circular base plate 20 is coupled. That is, in order to press the semi-circular base plate 20 into the lower case 24 and to keep it within a predetermined gap (approximately 1/100 mm), the influence of burrs generated during press working of the semi-circular base plate 20 is controlled. The groove 26 is formed on the inner edge of the lower case 24 so as to be excluded.

A beep generator having such a configuration and shape should be manufactured to a limited weight or less (eg 0.4 g, depending on the reliability and precision of the product). In response to these demands, the bee generator of the present invention has been manufactured with the least weight (implemented up to about 0.37 g) through calculation and experimentation of many internal structures, and its performance and function have been demonstrated to be the same or better than the conventional beeper generator.

The manufacturing process of the beep generator of the present invention will be described with reference to FIGS. 3 to 7.

First, the lower case 24 is inserted into the mold after the iron pieces formed with the terminals (30, 30a) and the fixed dummy terminals (32, 32a), respectively, and then injection molding with synthetic resin. In this case, the injection-molded lower case 24 has a groove 26 formed at an inner edge thereof, and a plurality of holes to which terminals 30 and 30a are connected are formed. In the center of the lower case 24 is formed a circular groove 27 so that the lower portion of the stick 22 is fixed. In addition, a plurality of circular protrusions 25 and 25a are formed at a predetermined position from the center of the lower case 24.

Next, the stick 22 and the semicircular base plate 20 which are integrally processed through the mold are seated on the lower case 24. The semicircular base plate 20 has a plurality of circular shapes at a predetermined position where the stick 22 is formed. Through holes 21 and 21a are formed. At this time, the lower end of the stick 22 formed in the center portion of the semi-circular base plate 20 slightly protrudes and is seated in the groove 27 formed in the center portion of the lower case 24, and the plurality of circular protrusions of the lower case 24 are formed. 25 and 25a are seated in the circular through holes 21 and 21a of the semicircular base plate 20. Therefore, the semi-circular base plate 20 seated on the lower case 24 is fixed without shaking left and right, and more firmly fixed using an adhesive between the lower case 24 and the semi-circular base plate 20. . In addition, the groove 26 formed at the edge of the lower case 24 forms a space portion at a predetermined interval with a lower end of the edge of the semicircular base plate 20 fixed to the lower case 24 to press the semicircular base plate 20. This is to avoid the influence of burrs generated on the inner surface during processing.

On the other hand, the coil 22 is wound on the stick 22 formed at the central portion of the semi-circular base plate 20 a predetermined number of times, and the coil 16 may be inserted into the stick 22 in the wound state. It can also wind up directly on the stick 22. Further, a permanent magnet 18 having a magnetic field of a predetermined size is seated at a predetermined distance from the outer circumference of the coil 16. At this time, the coil 16 and the permanent magnet 18 seated on the semi-circular base plate 20 is fixed with an adhesive. The input / output ends of the coils 16 are connected to the terminals 30 and 30a by soldering after the semi-circular base plates 20 are fixed.

After the semi-circular base plate 20, the coil 16, and the permanent magnet 18 are fixed in the lower case 24, the diaphragm 14 having the magnet plate 12 attached to the upper end of the lower case 24. ) Is raised.

After the diaphragm 14 is raised, the upper case 10 is covered and then bonded using ultrasonic waves from the upper end of the upper case 10. At this time, the fusion acid 28 formed on the upper case 10 melts while heat is generated by the vibration of the ultrasonic wave, and thermal bonding with the lower case 24 is performed.

Therefore, the present invention does not constitute a separate ring on which the diaphragm 14 is raised, as in the conventional method, does not use a printed circuit board, and press-processes the base plate and the stick integrally to manufacture a beep generator. It can be seen that the number of steps is significantly reduced.

As described above, those skilled in the art will readily recognize that the structures, configurations, and manufacturing processes of the present invention are not limited to the above, but modifications and variations of the present invention are possible.

As described above, the signal generating apparatus of the present invention comprises a semi-circular base plate in which sticks are integrally formed on the upper and sub-cases, a coil wound on the sticks, and a diaphragm with permanent magnets and magnet plates, thereby reducing unnecessary parts. By realizing compactness and weight reduction, the manufacturing cost and manufacturing time are reduced by shortening the manufacturing process, and it is designed to be excellent in high temperature and high temperature, thereby improving the accuracy and performance and reliability of the beep generator.

Claims (5)

In the beeper generator, An upper case 10 having a hole 11 configured to emit sound on one side thereof, A magnet plate 12 formed at a top of the upper case 10 and made of a ferromagnetic material; A diaphragm 14 installed at a lower end of the magnet plate 12 to convert a current signal generated by a predetermined thickness into a sound signal; A permanent magnet 18 installed at a lower end of the diaphragm 14 to generate a magnetic force having a predetermined size; A coil 16 wound on the inner side of the permanent magnet 18 a predetermined number of times; A stick 22 on which the coil 16 is wound; Semi-circular base plate 20 to which the stick 22 is fixed integrally, A lower case 24 to which the base plate 20 is fixed and coupled to the upper case 10; Tone generator characterized in that it comprises a terminal (30, 30a) connected to the input and output terminals of the coil (16) through the lower case (24). The signal generator according to claim 1, wherein the upper case (10) has a fusion fusion (28) formed on a surface coupled with the lower case (24). The beep generator according to claim 1, wherein the lower case (24) has a groove (26) formed on an inner circumference to which the semi-circular base plate (20) is coupled. The method of claim 1, wherein the lower case 24 is injection molding by inserting two dummy terminals (32, 32a) for fixing the beep generator and two terminals (30, 30a) connected to the input and output terminals respectively inserted into the injection mold. Characteristic sound generator. The tone generator according to claim 1, wherein the semi-circular base plate (20) is fixed by attaching a coil (16) and a permanent magnet (18) with an adhesive.