KR20000033207A - Smd-type super-compact sound converter - Google Patents

Abstract

PURPOSE: An SMD(surface mount device) type sound converter is provided to promote the reduction of labor costs and the improvement in productivity by automatically mounting a sound converter and contacting electrodes without brazing. CONSTITUTION: In a sound converter, a magnetic circuit unit(63) is composed of a circular permanent magnet(61), a yoke plate(62), a cup-shaped yoke(60) and a circular yoke plate(62). A vibration unit(66) is made up of a voice coil(64) inserted into a magnetic gas between the yoke(60) and the yoke plate(62), and a vibration plate(65) having a fixed bobbin wound with the voice coil. The magnetic circuit unit and the vibration unit are combined with a lower recessed groove of a housing(20). Three combining protrusions(21-23) are arranged per 120 degrees on the outer circumference of the housing. A protector is combined on the lower end of the housing to protect the magnetic circuit unit and the vibration unit. The upper portion of spring terminals(30,35) is inserted into the lower portion when the sound converter is combined to a PCB(printed circuit board). Therefore, the contact distance is extended and the entire height of the product is reduced.

Description

Surface Mount Ultrasonic Transducer

The present invention relates to a surface-mounted micro-acoustic transducer, and in particular, the housing is provided with a snap coupling protrusion for coupling the elastic terminal terminal and the housing integrally in the housing, and is automatically mounted on the set by the connection and snap coupling of the electrodes in almost 360 degree directions. The present invention relates to a surface mount type (SMD Type) micro-acoustic transducer capable of this omnidirectional mounting.

Acoustic regenerators are used for horn speakers, hi-fi audio systems such as component systems, system speakers consisting of woofers, midrange and tweeters covering a certain frequency band, general speakers covering all frequency bands in one unit, Micro-speakers having ultra-lightweight and ultra-slim structures, such as micro camcorders and walkmens, receivers used in mobile communication terminals, earphones having a structure in which some are inserted into the ear, and buzzers that receive only frequencies of a specific band.

In a conventional general speaker, a magnet is installed inside the yoke, and a bobbin in which a voice coil is wound is placed in a magnetic gap G of a magnetic circuit provided with a top plate. In addition, the upper part of the bobbin is respectively fixed to the upper and lower parts of the frame and the diaphragm and damper in which the central part is perforated in a circular shape, and a center cap (or dust cap) for blocking the bobbin hole at the center of the diaphragm is combined. It has a structure.

However, microspeakers (hereinafter referred to as "speakers") used in mobile phones, camcorders, notebook PCs, micro cassettes, etc., are designed to reduce the size of the set and omit the dampers to achieve a very small and ultra-thin structure. I adopt a coin structure that lowered.

In this case, a method of mounting the small speaker on a case or a printed circuit board (PCB) of the set will be described. The coin-shaped speaker 1 shown in FIG. 1A is fixed to the case of the set by using an adhesive or shown in FIG. 1B. As described above, a method of inserting and fixing using a fixing protrusion 3 formed in advance in the case 2 of the set or fixing to the case of the set using bolts and washers is mainstream.

In addition, an electrode connecting method for applying an electric signal to the speaker 1 from the set is connected to the electrode terminal 4 of the speaker 1 by soldering one side of the wire 5 as shown in FIGS. 1A and 1B. The side end is soldered to the output electrode pad printed on the PCB 6 of the set, or the terminal 7 of the connector pre-connected to the electrode terminal 4 of the speaker 1 as shown in FIG. The method of fastening to the pre-installed connector is mainly used.

However, such a conventional mounting method for mounting a speaker on a set and an electrode connecting method for connecting the electrodes are a process for mounting and connecting the speaker due to the difficulty of maintaining the electrode position at a constant direction and the irregularity of the wire for the electrode connection. Automation was difficult and the speakers had to be fixed by hand. For this reason, it is not possible to achieve a fundamental effect on the mounting of the speaker, and also a loss time for assembling the speaker is increased, and as a result, the set maker has a problem in that the output per unit time is reduced.

Accordingly, the present invention has been made in view of the problems of the prior art, and its object is to achieve a reduction in assembly labor costs and productivity by fully processing the mounting and the electrode connection of a set of acoustic transducers by soldering without soldering. To provide a surface-mounted micro-acoustic transducer that can be.

Another object of the present invention is to provide a surface-mounted micro-acoustic transducer capable of omnidirectional mounting in which the electrode can be connected in almost 360 degrees in all directions, thereby increasing the degree of freedom in the design of the electrode pad.

1A to 1C are exemplary views showing a connection example of a conventional ultra-small acoustic transducer;

2 is a plan view of a surface-mounted micro-acoustic transducer capable of omnidirectional mounting according to the present invention;

3 is a bottom view of FIG. 2;

4 is a cross-sectional view taken along the line A-A of FIG.

5A and 5B are a plan view and a front view of a spring terminal,

6 is a plan view of a plate terminal,

7 is a plan view of the terminal guide,

8 is a plan view of the spring terminal assembled state,

Fig. 9 is a sectional view of a state in which the acoustic transducer of the present invention is mounted on a set.

* Explanation of Signs of Major Parts of Drawings *

20; Housing 21-23; Engaging protrusion

21a-23a; Leg 24; Leak hole

30,35; Spring terminal 31; Top

32; Bottom 40; Terminal guide

41,42; Hole 43; Guide

44; Terminal guide support projection 45; Terminal Guide Stand

50; Plate terminals 51,52; Electrode terminal

53,54; Electrode pads 55; Board

60; Yoke 61; Permanent magnet

62; Yoke plate 63; Magnetic circuit part

64; Voice coil 65; tympanum

66; Vibration part 67; Protectors

68; Acoustic impedance adjusting cloth 69; Leak hole

70; Case 71; Printed circuit board

72; Support protrusion 73; screw

74; Cushion member 100; Acoustic transducer

In order to achieve the above object, the present invention includes a magnetic circuit portion consisting of a permanent magnet, a cup-shaped yoke having the permanent magnet embedded therein, and a circular yoke plate installed on the permanent magnet; A vibration unit including a voice coil inserted between the magnetic gap between the yoke and the yoke plate and a diaphragm to which a bobbin to which the voice coil is wound is fixed; A plate terminal disposed on a lower surface of the yoke and printed with first and second electrode terminals connected to lead wires of the voice coil; A housing having a multi-stage groove structure and having an outer circumferential portion of the diaphragm supported in the upper groove, and supporting a side portion of the yoke and an outer portion of the plate terminal in the lower groove; First and second elastic terminal terminals having one end elastically supported at each electrode terminal of the plate terminal; Each of the first and second elastic terminal terminals and the printed circuit board is composed of a plurality of snap coupling protrusions each having an elastic force in the outward direction of the housing and being snapped into the coupling holes of the printed circuit board embedded in the set. It provides a surface-mounted acoustic transducer, characterized in that the first and second electrode pad provided in the electrical / elastic connection.

As described above, in the present invention, the mounting is completed and the electrode is connected by simply pushing the coupling protrusion of the acoustic transducer into the coupling hole formed in the PCB of the set by including the elastic terminal terminal and the snap coupling protrusion for housing coupling integrally in the housing. Set makers can increase assembly productivity because they are automatically connected by these elastic terminal terminals. In addition, the electrode can be connected in almost 360 degrees of all directions, so it is easy to design and assemble the electrode pad.

(Example)

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

2 is a plan view of a surface mountable ultra-small acoustic transducer capable of omnidirectional mounting according to the present invention, FIG. 3 is a bottom view of FIG. 2, and FIG. 4 is a cross-sectional view taken along line A-A of FIG.

First, when the acoustic transducer 100 of the present invention is mounted on the PCB 71 or the like of the set, the acoustic transducer 100 is snap-coupled as shown in FIG. In the following description, the acoustic transducer will be described based on the inverted state.

As shown in FIG. 4, the acoustic transducer of the present invention includes a magnetic circuit part 63, a yoke 60, and a circular permanent magnet 61, a cup-shaped yoke 60, and a circular yoke plate 62. A multi-stage groove structure is formed by the vibration part 66 made up of the voice coil 64 inserted between the magnetic gaps G between the yoke plates 62 and the diaphragm 65 on which the bobbin on which the voice coil 64 is wound is fixed. It is coupled to the lower groove of the housing (or frame) 20 having a.

The outer side of the housing 20 is disposed at intervals of 120 degrees and three coupling protrusions 21-23 having an elastic force extending outwardly are vertically formed on the upper end is integrally formed, and the magnetic circuit part 63 and The protector 67 is provided with a plurality of leak holes 69 while protecting the vibrator 69.

In addition, the upper side of the yoke 60 is provided with a plate terminal 50 which is partially embedded in the housing 20 together with the yoke by insert molding method, and two spring terminals ( The terminal guide 40 coupled with the 30 and 35 is installed on the terminal guide supporting jaw 45 formed on the open inner circumferential surface of the housing 20 and coupled with the plurality of terminal guide support protrusions 44.

The housing 20 has a plurality of leakage holes 24 vertically formed outside the magnetic circuit unit 63 for entering and exiting air, and on the upper surface of the housing including the leakage holes 24, an acoustic impedance adjusting cloth is provided. (68) is attached.

The housing 20 is molded by an injection molding method using a thermoplastic or thermosetting polymer material such as ABS, polycarbonate (PC), nylon, and phenol, and the spring terminals 30 and 35 are made of hard steel wire, beryllium copper wire or phosphor bronze copper wire. The material having excellent conductivity, solderability, and contact resistance is made of a circular spring having a two-stage structure with different diameters as shown in FIGS. 5A and 5B.

Thus, when the acoustic transducer 100 is coupled to a set of PCBs described later, the upper portion 31 of the spring terminals 30 and 35 can be drawn into the lower portion 32 to extend the relative contact distance and to produce the product in close contact. Make the overall height as small as possible.

In addition, the spring guide 40 has a shield-like shape as shown in FIG. 7 and is smaller than the lower portion 32 of the spring terminals 30 and 35 at a position corresponding to the center of the acoustic transducer and a distance away therefrom. Larger holes 41 and 42 than the upper portion 31 are formed to extend the spring terminals 30 and 35 from the electrode terminals 51 and 52 of the plate terminal 50 of FIG. 6. 54) to be in electrical / elastic crimp contact.

The spring guide 40 may be manufactured by injection molding or press working with epoxy, bakelite or thermoplastic or thermosetting plastic material, and at its periphery, a plurality of spring guides 40 for mounting to the support protrusion 44 of the housing 20 are provided. Guide grooves 43 are formed, and they are coupled by pressure fusion by heat, ultrasonic waves, or high frequency.

In addition, the plate terminal 50 has a structure in which copper foil is coated on an epoxy or beckite substrate 55, one side of which is in contact with the top surface of the yoke 60 inserted into the housing 20, and the other side of the plate terminal 50 has an outer end of the housing. It extends to the shield shape. Lead wires of the voice coils 64 are soldered to the electrode terminals 51 and 52, and the electrode patterns 53 and 54 extending from the electrode terminals 51 and 52 to the center portion are spring terminals 30 and 35 as described above. Electrically / elastic contact with the lower portion 32 of the c) causes electrical signals from the set to be applied to the voice coil 64.

The acoustic transducer of the present invention having the structure as described above has a coupling protrusion 21-extending to an upper portion of the housing 20 in a coupling hole formed in the PCB 71 on which various circuit components of the set are mounted, as shown in FIG. When pushing 23 from the bottom, the legs 21a-23a connecting the coupling protrusions 21-23 from the main body of the housing 20 have elastic force, so the coupling protrusions are snap-coupled.

In this case, the spring terminals 30 and 35 of the acoustic coupler 100 are compressed between the lower surfaces of the PCB 71 and the electrode patterns 53 and 54 of the plate terminal 50 of the acoustic transducer 100 and the PCB 71. Electrical / elastic contact with the set of output electrode pads located on the bottom surface of the panel allows electrical signals to be applied to the voice coil 64 of the acoustic transducer.

At this time, it is preferable to insert the cushion member 74 between the lower portion of the acoustic transducer 100 and the bottom surface of the case 70 of the set. In FIG. 9, reference numeral 73 denotes a screw for fixing the PCB 71 to the support protrusion 72 of the case 70.

Accordingly, when the coupling protrusions 21-23 of the acoustic transducer 100 are snapped to the PCB 71 having three curved coupling holes of a predetermined length at almost 120 degrees, a pair of terminal springs of the acoustic transducer 100 ( 30, 35) can be easily connected to a pair of output electrode pads of the PCB. That is, when the coupling position of the terminal spring 30 located in the center is matched to any one of the output electrode pads, the remaining terminal springs 35 are easily and automatically placed on the remaining output electrode pads formed in a circular shape at a predetermined distance away from them. Can be connected.

In the above-described embodiment, an example having a coin-shaped structure among the micro-acoustic transducers is illustrated, but the present invention can be applied to any structure having a different shape, and moreover, it can be adopted for automatic mounting in any acoustic transducers employed in portable electronic devices. . In addition, the number of engaging projections is not necessarily limited to three, but may be composed of two or four depending on the shape of the sound transducer. In addition, since the angle formed between the coupling protrusions is determined according to the number of coupling protrusions and the shape of the acoustic transducer, the angle is not limited to 120 degrees and may be changed as necessary.

As described above, in the present invention, the mounting is completed and the electrode is connected by simply pushing the coupling protrusion of the acoustic transducer into the coupling hole formed in the PCB of the set by including the elastic terminal terminal and the snap coupling protrusion for housing coupling integrally in the housing. Set makers can increase assembly productivity because they are automatically connected by these elastic terminal terminals. In addition, the electrode can be connected in almost 360 degrees of all directions, so it is easy to design and assemble the electrode pad.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (5)

A magnetic circuit portion comprising a permanent magnet, a cup-shaped yoke having the permanent magnet embedded therein, and a circular yoke plate installed on the permanent magnet; A vibration unit including a voice coil inserted between the magnetic gap between the yoke and the yoke plate and a diaphragm to which a bobbin to which the voice coil is wound is fixed; A plate terminal disposed on a lower surface of the yoke and printed with first and second electrode terminals connected to lead wires of the voice coil; A housing having a multi-stage groove structure and having an outer circumferential portion of the diaphragm supported in the upper groove, and supporting a side portion of the yoke and an outer portion of the plate terminal in the lower groove; First and second elastic terminal terminals having one end elastically supported at each electrode terminal of the plate terminal; Each of the first and second elastic terminal terminals and the printed circuit board is composed of a plurality of snap coupling protrusions each having an elastic force in the outward direction of the housing and being snapped into the coupling holes of the printed circuit board embedded in the set. Surface-mounted acoustic transducer, characterized in that for electrically and elastically connecting the first and second electrode pads provided in. The method of claim 1, wherein the first electrode terminal and the first elastic terminal terminal are positioned at the center of the housing, and the second electrode terminal and the second elastic terminal terminal are positioned at a predetermined distance from the center. Surface mount acoustic transducer. The method of claim 1, wherein one of the first and second electrode pads is disposed to mate with the first elastic terminal terminal, and the first and second elastic terminal terminals have excellent conductivity, solderability, and contact resistance, respectively. Surface-mounted acoustic transducer consisting of a metal material and consists of a circular spring having a two-stage structure with a difference in diameter. The method of claim 3, further comprising a spring guide formed at a position corresponding to the center of the housing and at a distance away from the elastic terminal terminal, the hole being smaller than the lower portion and larger than the upper portion. And supporting the elastic terminal terminal by contacting the electrode terminal of the plate terminal with electrical / elasticity. According to claim 1, A plurality of leakage holes formed perpendicular to the housing for the air in and out of the magnetic circuit portion, An acoustic impedance adjusting cloth attached to a lower surface of the housing including the leakage hole; And a protector having a plurality of leak holes formed on the upper surface of the housing while protecting the magnetic circuit unit and the vibration unit.