Patent Description:
Generally speaking, an electroacoustic component includes a piezoelectric buzzer, a magnetic buzzer, a dynamic speaker, and the like. Among them, the piezoelectric buzzer uses the piezoelectric effect of the piezoelectric ceramic to drive the vibration of the diaphragm to generate sound, and the magnetic buzzer uses the electromagnetic to energize and de-energize the metal diaphragm to generate vibration and then sound. However, the dynamic speaker uses the magnetic field effect generated by the coil energization to drive the diaphragm to vibrate and sound. Therefore, the electroacoustic components are generally assembled on the PCB and sounded by the driving of the conductive loop provided by the circuit layer of the PCB.

It is known that when we assemble electronic components, such as ICs and electroacoustic components, on the PCB, it generally depends on surface mounting technology (SMT), which is printed with solder paste on the surface of the circuit layer of the PCB, and then adsorbed by, for example, a suction cup on a robot. The electronic component is plugged into the PCB, and then the electronic component and the solder paste which have been plugged on the surface of the PCB are welded by a reflow oven (for example, IR oven), so that the electronic component can be firmly adhered to the circuit of the PCB. The surface of the layer is used to turn on the conductive loop of each of the electronic components on the PCB.

The electroacoustic components of the above electronic components are generally composed of the sound producing components assembled in a housing. The electroacoustic component is exemplified by a piezoelectric buzzer, the sound producing components that are assembled in a housing thereof includes a piezoelectric ceramic element, a diaphragm, a circuit board and conducting terminals, etc., these sound producing components must be subjected to a high temperature baking of about <NUM> in the reflow oven during the fusion welding process of the above reflow oven. In this high temperature environment, in addition to test the characteristics of enduring temperature of the housing material, it also affects the electrical characteristics of, for example, the piezoelectric buzzers, diaphragms, the circuit boards, and the like.

Faced with this problem, today's operators can only utilize materials that can withstand high temperature of the above reflow oven to make for the housing and sound producing components of the electroacoustic component, but thus increase the cost of producing the electroacoustic component. It needs to be improved.

Patent application publications <CIT> and <CIT> and patent specification <CIT> disclose a socket for an electroacoustic component, respectively, wherein the socket is subjected to a heat treatment in a reflow oven in order to fix the socket on a printed circuit board. The housing of the electroacoustic component is configured to fit in the socket after said heat treatment. Patent application publication <CIT> describes an electro-acoustic transducer that is directly arranged on a printed circuit board and then subjected to a heat treatment for fixing the same thereon. According to patent application publication <CIT> an electroacoustic transducer is electrically connected to a printed circuit board by means of a spring terminal.

An object of the present invention is to minimize the effects upon high temperature baking of the reflow oven on the housing of the electroacoustic component and the sound producing components assembled, so as to maintain the electrical characteristics of these components.

In order to achieve the above-mentioned object, a preferred embodiment of the present invention is directed to a method for mounting an electroacoustic component on a PCB comprising the steps of:.

According to the present invention, the electroacoustic component is preferably one of a piezoelectric buzzer, an magnetic buzzer, and a dynamic speaker, and one of the plurality of sound producing components is the PCB.

In order to specifically implement the above-mentioned method, the present invention further provides an electroacoustic component structure suitable for mounting on the PCB comprising:.

In a further implementation of the present invention, the shell seat preferably comprises a seat body and a set of seat cover disposed on the seat body, the chamber is formed in the seat body.

In a further implementation of the present invention, the at least two conducting terminals are respectively bent to form a J-shaped body exposed on two opposite end surfaces of the base seat, so as to electrically connect at least one of the contacts on the PCB and the plurality of sound producing components.

In the implementation of the above method and structure of the present invention, the electroacoustic component may be one of a piezoelectric buzzer, an magnetic buzzer, and a dynamic speaker. In addition, just the base seat is made of a heat-resistant plastic, and the shell seat and the sound producing component can be excluded from utilizing the heat-resistant plastic.

According to the above technical means, the overall improvement of the present invention is to maintain the electrical characteristics of the electroacoustic component that has been adhered to the PCB, comprising the electrical characteristics of the piezoelectric buzzer, the diaphragm, circuit board, etc. in the electroacoustic component. In addition, the present invention can also eliminate the utilization of high temperature resistant material to fabricate the shell seat of the electroacoustic components (including the seat body and the seat cover), the piezoelectric buzzer, the diaphragm, circuit boards, etc., thus reducing the cost of producing electro-acoustic components.

The specific implementation details of the above technical means and their production performance of the present invention will be described with reference to the following embodiments and drawings.

First, referring to <FIG>, a method for mounting an electroacoustic component on a PCB according to the present invention comprises the following steps S1 to S3 being performed in sequence:.

Please refer to <FIG>, which illustrates a pre-construction of the housing <NUM> of the electroacoustic component by means of a plastic injection molding technique, which can be independently integrated and then combined and integrated into a shell seat <NUM> and a base seat <NUM>. The shell seat <NUM> is pre-installed with a plurality of sound producing components <NUM> having electrical characteristics susceptible to high temperature, the plurality of sound producing components <NUM> including at least one circuit board <NUM>, and the base seat <NUM> is pre-mounted to comprise at least two conducting terminals <NUM>. The base seat <NUM> is made of a heat-resistant plastic, and the shell seat <NUM> and the sound producing component <NUM> are excluding the utilization of the heat-resistant plastic. The heat-resistant plastic refers to a plastic that can withstand high temperature baking at a reflow oven of about <NUM>.

Please refer to <FIG> and <FIG> in sequence to illustrate that the solder paste is printed on the contacts <NUM> of the PCB <NUM>, and then the base seat <NUM> is captured by the robot, for example, and placed on the PCB <NUM> (as shown in <FIG>). The conducting terminals <NUM> on the base seat <NUM> are brought into contact with the contacts <NUM> on the PCB <NUM>, and then the PCB <NUM> is moved into a reflow oven <NUM> (as shown in <FIG>) by means of a reflow oven <NUM>. The high temperature baking at <NUM> causes the solder paste to melt, so that the conducting terminals <NUM> on the base seat <NUM> and the contacts <NUM> on the PCB <NUM> can be adhered to each other and electrically connected.

Please refer to <FIG> in order to remove the PCB <NUM> with the base seat <NUM> adhered from the reflow oven <NUM>, so that the PCB <NUM> with the base seat <NUM> adhered away from the high temperature in the reflow oven <NUM>. The shell seat <NUM> can be picked up by, for example, an robot in a normal temperature or room temperature environment, and the shell seat <NUM> can be buckled or screwed onto the base seat <NUM> that has been adhered to the PCB <NUM> (as shown in <FIG>). When the shell seat <NUM> and the base seat <NUM> are integrated, the conducting terminals <NUM> on the base seat <NUM> can be electrically connected to at least two circuit terminals <NUM> on the circuit board <NUM> in the shell seat <NUM> to form an electrical connection. An integral electroacoustic component is bonded to the PCB <NUM> (as shown in <FIG>). In this way, the plurality of sound producing components <NUM> installed in the shell seat <NUM> and the shell seat <NUM> can be prevented from being subjected to high temperature in the reflow oven <NUM>.

In order to specifically implement the above method, referring to <FIG>, the first structural embodiment of the piezoelectric buzzer as the electroacoustic component of the present invention is disclosed, and the piezoelectric buzzer is illustrated. The structure of the piezoelectric buzzer comprises the above-mentioned shell seat <NUM>, the base seat <NUM> and the plurality of sound producing components <NUM>.

A chamber <NUM> for mounting the plurality of sound producing components <NUM> is formed in the shell seat <NUM>, and a connecting part <NUM> is formed on a wall of the housing at one end of the shell seat <NUM>. In the present embodiment, the sound producing component <NUM> comprises a buzzer piece <NUM> made by piezoelectric ceramics, a diaphragm <NUM>, a circuit board <NUM>, and the like, and the diaphragm <NUM> is made to reciprocally vibrate and of conical basin shape. The circumferential surface of the diaphragm <NUM> is fixed to the wall surface of the chamber <NUM>, and the central pelvic region of the buzzer piece <NUM> is attached to the diaphragm <NUM>, and the buzzer piece <NUM> electrically connected to the circuit board <NUM> is further externally connected to the power supply end so as to utilize the piezoelectric effect of the buzzer piece <NUM> to drive the diaphragm <NUM> to vibrate and sound.

In order to facilitate the convenience of assembling the sound producing component <NUM> in the shell seat <NUM>, the shell seat <NUM> can be implemented to comprise a seat body 11a and a set of seat covers 11b disposed on the seat body 11a. The chamber <NUM> is formed in the seat body 11a, and the chamber <NUM> has a fixing plate <NUM> therein. The fixing plate <NUM> may be fixed in the seat body 11a by press fitting, or may be integrally formed by the wall surface of the chamber <NUM> of the seat body 11a. The circuit board <NUM> is fixed by the fixing plate <NUM> in the chamber <NUM>. The two ends of the seat body 11a are respectively formed with a first opening <NUM> and a second opening <NUM>. The connecting part <NUM> may be a single or a plurality and is formed in a ring form or a spaced-apart form on the seat body 11a around the first opening <NUM>. The second opening <NUM> of the seat body 11a communicates with the chamber <NUM>, and the seat cover 11b is, for example, a press buckle disposed on the second opening <NUM>. The diaphragm <NUM> is disposed between the seat body 11a and the seat cover 11b and is located in the chamber <NUM>. The seat cover 11b is formed with at least one sound hole <NUM>. The sound emitted from the vibration of the buzzer piece <NUM> is transmitted to the outside through the sound hole <NUM>.

Further, the base seat <NUM> is formed in a disk shape capable of covering one end portion of the shell seat <NUM>, and one end surface of the base seat <NUM> is formed with a docking section <NUM> for coupling the connecting part <NUM>. The connecting part <NUM> and the docking section <NUM> can be implemented as a combination of a card rib having a male and female locking ability and a wedge slot relative to the wedge ring, or a combination form in which the screw is relatively locked.

When the connecting part <NUM> and the docking section <NUM> are implemented in the form of the male and female wedge ring and the wedge slot shown in <FIG>, the robot for picking up the shell seat <NUM> only needs to perform the press action of position-to-bit. When the positional pressing action is performed, the shell seat <NUM> can be press-bonded to the base seat <NUM> of the PCB <NUM>. When the connecting part <NUM> and the docking section <NUM> are formed into a screw-locking combination (common screwing, the technical application is not shown). The robot for picking up the shell seat <NUM> just performs the aligned rotation operation, so as to bond the shell seat <NUM> to the base seat <NUM> of the PCB <NUM>. In the current control technology of the robot, the above two combinations can enable the shell seat <NUM> to accurately align the positive and negative electrodes with the conducting terminals <NUM> and the circuit terminals <NUM> when the base seat <NUM> is coupled for stably electrical connection.

Further, at least one notch <NUM> is further formed on the docking section <NUM>. When the shell seat <NUM> and the base seat <NUM> are integrated, the connecting part <NUM> can be pushed by the tool through the notch <NUM>, so that the connecting part <NUM> and the docking section <NUM> are no longer maintained in a coupled state, thereby enabling the shell seat <NUM> to be separated from the base seat <NUM>.

Further, the base seat <NUM> is provided with the two conducting terminals <NUM>, and the two conducting terminals <NUM> can be bent and made from a metal piece to form a J-shaped body, so that the conducting terminals <NUM> can be sequentially arranged from the outer end surface 12a and the end wall 12b of the base seat <NUM> and are extended to the inner end surface 12c of the base seat <NUM> to be fixedly fastened to the base seat <NUM>, so that the double ends of the conducting terminals <NUM> can be respectively exposed on the opposite sides of the base seat <NUM>. The end faces (the outer end surface 12a and the inner end surface 12c) are disposed so that the double ends of the conducting terminals <NUM> can be electrically connected to the circuit terminals <NUM> of the circuit board <NUM> and the contacts <NUM> on the PCB <NUM>, respectively. Accordingly, when the PCB <NUM> is energized, an excitation voltage can be output to the buzzer piece <NUM> via the circuit board <NUM> in the piezoelectric buzzer (i.e., the electroacoustic component) so as to be attached to the flexible diaphragm <NUM>. The buzzer piece <NUM> located at the basin area of the flexible diaphragm <NUM> generates a vibration frequency, which in turn makes a sound.

The two circuit terminals <NUM> on the circuit board <NUM> may be made of an elastic element such as a spiral compression spring, and the two circuit terminals <NUM> have positive and negative electrodes. When the shell seat <NUM> and the base seat <NUM> are integrated, the two circuit terminals <NUM> can be in close contact with the two conducting terminals <NUM> on the base seat <NUM> according to the requirements of the positive and negative conductive paths thereof to maintain the electrical connection of two elements.

Please refer to <FIG> and <FIG> again. The seat cover 11b is formed with a limiting post <NUM> extending from the seat cover 11b into the seat body 11a (that is, in the chamber <NUM>). To limit the amplitude of the diaphragm <NUM>, a fixing sponge <NUM> is fixed on the fixing plate <NUM>, and the sponge <NUM> can be regarded as an accessory of the sound producing component <NUM>, and is disposed in the shell seat <NUM> along with the sound producing component <NUM>, thereby avoiding the high temperature interference of the reflow oven. The buzzer piece <NUM> is located between the limiting post <NUM> and the sponge <NUM>. Thereby, the buzzer piece <NUM> can maintain the stable vibration frequency by the restraint of the sponge <NUM> and the limiting post <NUM> when vibrating.

Please refer to <FIG>, which illustrates a second structural embodiment of the present invention using a magnetic buzzer as an electroacoustic component, illustrating the structure of the magnetic buzzer and the first piezoelectric buzzer described above. The biggest difference between the devices is that the plurality of sound producing components <NUM> installed in the shell seat <NUM> of the housing <NUM> are replaced by the well-known circuit board 23a, connecting coils <NUM>, the corresponding magnetic poles <NUM>, the magnets <NUM> and the diaphragm 22a, etc. The two circuit terminals <NUM> are replaced and made of elastic elements of the non-helical compression spring. In more details, the two circuit terminals <NUM> are made by bending the conducting terminals <NUM> on the base seat <NUM> to form a tilted arm lifted configuration. Therefore, when the shell seat <NUM> and the base seat <NUM> are integrated, the two circuit terminals <NUM> can be electrically connected to the positive and negative contacts on the circuit board 23a according to their positive and negative electrical polarity. In addition, the internal structure of the shell seat <NUM> is formed by combining the seat body 61a and the seat cover 61b and is matched to install the sound producing component <NUM> described above, so that the magnetic buzzer can utilize the coil <NUM> during turning on and turning off and is activated to vibrate by the action between the magnetic pole <NUM> and the magnet <NUM> to drive the diaphragm 22a to generate sound. In addition, the rest of the structure and the mounting method of the embodiment are substantially the same as those of the first embodiment. In particular, the present embodiment fully applies the above method of the present invention to perform the step of mounting the electroacoustic component on the PCB.

Please refer to <FIG> to illustrate a third structural embodiment of the present invention using a dynamic speaker as an electroacoustic component. The biggest difference between the structure of the dynamic speaker and the first embodiment piezoelectric buzzer described above is that the plurality of sound producing components <NUM> mounted in the shell seat <NUM> of the housing <NUM> are electrically connected and replaced by the well-known printed circuit electrode <NUM>, the yoke <NUM>, and the voice coil <NUM>, and correspondingly assembled magnet <NUM>, the diaphragm 22b, and the like. The printed circuit electrode <NUM> is used to replace the circuit board of the first and second embodiments, and the two circuit terminals <NUM> are made by bending the conducting terminals <NUM> on the base seat <NUM> to form a tilted arm tilting shape for facilitating the electrical connection between the two circuit terminals <NUM> and the printed circuit electrode <NUM> when the shell seat <NUM> is integrated with the base seat <NUM>. In addition, the internal structure of the shell seat <NUM> formed by combining the seat body 71a and the seat cover 71b is matched to mount the sound producing component <NUM> described above, so that the dynamic speaker can excite the yoke <NUM> by using the printed circuit electrode <NUM> and the voice coil <NUM> generates a magnetic field effect to activate the diaphragm 22b to vibrate. In addition, the rest of the structure and the mounting method of this embodiment are substantially the same as those of the first embodiment. In particular, the present embodiment is fully applicable to the above-described method of the present invention to perform the steps of mounting an electroacoustic component on the PCB.

Claim 1:
A method for mounting an electroacoustic component on a PCB comprising the steps of:
(S1) separately constructing a housing (<NUM>) of the electroacoustic component, the housing (<NUM>) comprising a shell seat (<NUM>) and a base seat (<NUM>) which are separate and then combined into a single body, and a plurality of sound producing components (<NUM>) being pre-installed in the shell seat (<NUM>), and the base seat (<NUM>) being pre-installed and comprising at least two conducting terminals (<NUM>);
(S2) adhering the base seat (<NUM>) to the PCB (<NUM>), so that the at least two conducting terminals (<NUM>) on the base seat (<NUM>) and at least two contacts (<NUM>) on the PCB (<NUM>) adhere to each other and are electrically connected in a reflow oven (<NUM>); and
(S3) combining the shell seat (<NUM>) and the base seat (<NUM>), so that the shell seat (<NUM>) comprising the plurality of sound producing components (<NUM>) is combined with the base seat (<NUM>) adhered to the PCB (<NUM>) outside the reflow oven (<NUM>) into a single body, and the at least two conducting terminals (<NUM>) being electrically connected to at least one of the plurality of the sound producing components (<NUM>) to be configured to be attached to the electroacoustic component on the PCB (<NUM>), wherein the base seat (<NUM>) is made of a heat-resistant plastic, and the shell seat (<NUM>) and the sound producing components (<NUM>) are excluded from being made of the heat-resistant plastic,
wherein one end of the shell seat (<NUM>) is formed with a connecting part (<NUM>), one end of the base seat (<NUM>) forms a pair of docking sections (<NUM>) for coupling the connecting part (<NUM>), and the shell seat (<NUM>) and the base seat (<NUM>) can be combined with each other at the outside of the reflow oven (<NUM>) into a single body, by means of the combination of the connecting part (<NUM>) and the docking sections (<NUM>) such that the at least two conducting terminals (<NUM>) are electrically connected to at least one of the plurality of sound producing components (<NUM>).