KR20100130924A

KR20100130924A - Film type speaker and manufacturing method thereof

Info

Publication number: KR20100130924A
Application number: KR1020090049675A
Authority: KR
Inventors: 박광일
Original assignee: 주식회사 선민텔레콤
Priority date: 2009-06-04
Filing date: 2009-06-04
Publication date: 2010-12-14

Abstract

The present invention provides a film-type speaker and a method of manufacturing the same type of piezoelectric material having a separate function by applying a structure for improving the quality while implementing a film-type speaker by adding a variety of functions, and having a complex function by effectively adding various functions. The present invention relates to a piezoelectric thin film mixed with a non-piezoelectric polymer capable of effectively transmitting vibration of PZT powder, which is a piezoelectric material, and at least one unit vibrator on which an electrode is applied to the upper and lower portions of the thin film. By attaching to the diaphragm diaphragm reinforces the volume and bass, there is an effect of increasing the yield of the manufacturing process. On the other hand, there is an effect to provide a film-type speaker having a complex function without increasing the volume by adding a light emitting unit or a touch sensor of the same type as the vibrator to the film-type diaphragm.

Description

Film-type speaker and its manufacturing method {FILM TYPE SPEAKER AND MANUFACTURING METHOD THEREOF}

The present invention relates to a film-type speaker and a method of manufacturing the same, in particular, by constructing a separate vibration unit of a new type of piezoelectric material to implement a film-type speaker while applying a structure to improve the quality and effectively add a variety of functions size The present invention relates to a film type speaker and a method for manufacturing the same, which have a composite function without a change.

With the increase of various electronic devices and their use in daily life, new types of user interfaces that are not only of good quality but also appealing in terms of emotion are required.

One of the functions sensitively exposed to the user among these user interfaces is a speaker that provides sound. These speakers are relatively bulky and difficult to apply in new designs, but are becoming smaller and thinner to meet the needs of users who want smaller or thinner electronics.

1 shows the structure of a typical speaker 10. In general, the speaker 10 has a structure in which the diaphragm 13 connected to the voice coil 12 vibrates to generate sound when the magnetic field of the voice coil 12 disposed adjacent to the magnet 11 is changed as a signal according to the sound. Has This can generate a high quality sound but has a limitation in that the thickness becomes thick due to the structure of the voice coil 12 and the diaphragm 13 and the necessity of a gap. This is a limitation in application to the current acoustic products with a portable device or thin structure, and also in terms of design.

Overcoming these limitations of thickness, a speaker having a film form has been introduced to be applied to portable devices or thin devices, and to enable various designs.

2 shows a structure of a general film speaker, and as shown in FIG. 2, transparent electrode layers 30 and 40 are formed on the entire front and rear surfaces of the piezoelectric film 20, respectively, and power is applied to the transparent electrode layers 30 and 40. It has the structure which formed the conductor electrodes 35 and 45 for providing, respectively.

The commercialized film speaker utilizes the piezoelectric properties of the polymer material PVDF (Polyvinylidene fluoride) and connects electrodes to the piezoelectric film 20 processed PVDF in the form of a film and applies a signal according to the sound to vibrate the front surface of the film. Generate. At this time, the front surface of the piezoelectric film 20 and the electrode layers 30 and 40 is the main body of vibration and does not use a separate diaphragm. Since these PVDF films have transparency, they are pioneering a new market of transparent thin-film speakers with their design strength.

However, such a PVDF film can be used as a speaker only when a high driving voltage is applied, and the driving voltage is as high as about 100V. Therefore, a boost configuration for generating a high voltage is required and a transformer for impedance matching is needed because of its large impedance. In addition, the PVDF film speaker employs a high resistance transparent electrode (eg, PEDOT, ITO, CNT, etc.) to provide even voltage across the entire film surface while maintaining transparency. The high resistance of such a transparent electrode is that when a voltage is applied through an electrode formed at one side, a high current flows to a portion where the voltage is applied, and thus a separate electrode is required due to high risk of overheating, breakage, and fire. This high and complex manufacturing process.

On the other hand, when the size of PVDF film is small, it is difficult to reduce it to below a certain size because the bass characteristics deteriorate sharply. Therefore, currently commercially available film speakers apply PVDF to the front surface of the film constituting the speaker. In the case of the PVDF film, each side of the film must be pulled and fixed with sufficient tensile strength so that the piezoelectric properties appear, so that the process is not easy and the risk of breakage is high.

In addition to the film speaker structure, some piezoelectric ceramic buzzers (aka piezo buzzers) are used as thin speakers, but the output is small and weak in low frequencies to be used as a full-fledged speaker. have. In particular, since the piezoelectric ceramic buzzer has a thin thickness of 1 mm or less, there is a high risk of breakage when forming an electrode, and when affixed to a metal plate used as an electrode, bubbles are generated or negative distortion occurs when bonded to a non-uniform adhesive. Since this becomes worse, there is a limit to the size that can be produced.

Recently, there have been studies to improve the piezoelectricity by mixing PZT powder in such piezoelectric polymer (primarily PVDF), but when PZT is mixed with piezoelectric polymer in the form of dispersed granules, the mixed material is stretched for piezoelectric properties of the piezoelectric polymer. Due to the granular PZT incorporation structure, the polymer is easily ruptured, which makes it impossible to function as a piezoelectric body. Therefore, even if such a composite material is formed, it is difficult to stretch it, so most vibrations are generated by PZT, and the piezoelectric polymer hardly vibrates, so the piezoelectric properties are not good for cost.

After all, the existing film speaker has high cost by applying PVDF film to the entire surface of the front of the speaker for low sound characteristics, and the entire speaker is composed of only the direct vibration surface, so the PVDF thickness must be changed to change the sound characteristics. This is difficult. In addition, conventional piezoelectric ceramics are fragile and difficult to form a uniform electrode, which makes it difficult to construct a certain size or more, and thus has low bass characteristics, and there is a configuration in which PZT and polymer are mixed and cured. There is. In addition, in some cases, a flexible piezoelectric composite material was formed by mixing PZT powder with PVDF. However, expensive PVDF was used as a medium because the PVDF could not be tensioned due to breakage caused by the mixed PZT powder, but the performance was not improved.

Therefore, there is a need for a new type of film type thin film speaker which is cheap and has high productivity and improves performance, and has a low bass characteristic even when using a small piezoelectric material.

In order to solve the high cost and configuration difficulties of the existing film speaker as described above, an object of the present invention newly proposed to provide a sufficient volume and the non-piezoelectric polymer that can effectively transmit the vibration PZT powder, a piezoelectric material and A piezoelectric thin film is mixed to prepare a vibrator in which one or more unit vibrators are applied to upper and lower piezoelectric thin films, and then attached to a film type diaphragm having electrodes to improve volume and sound quality, and to reinforce low sound. It is to provide a speaker and a method of manufacturing the same.

Another object of the embodiments of the present invention is to provide a film-type speaker and a method of manufacturing the same, which allows a plurality of thin vibrators to be formed on a film-type diaphragm to freely design volume and speaker sound range characteristics.

Still another object of the embodiments of the present invention is to attach a film type diaphragm to the front and rear surfaces of the thin vibrator so that a plurality of diaphragms ring at the same time, thereby reinforcing bass and changing the phase to increase the volume and the manufacture thereof To provide a way.

Another object of the embodiments of the present invention is to attach one or more film diaphragms with a thin vibrator therebetween, an electrode provided to the thin vibrator, and a thin light emitting unit configuration dispersedly disposed on the film diaphragm film structure To provide a film-like speaker and a method of manufacturing the same so that a plurality of functions can be provided.

Another object of the embodiments of the present invention further comprises a thin sensor having the same or similar structure as the thin vibrator to the film diaphragm in a configuration in which the thin vibrator is attached to the film diaphragm, and the thin sensor is electrically By providing a signal to perform a control interface function to provide a film-type speaker and a method of manufacturing the same to provide an efficient and new type of interface while minimizing process changes.

According to one or more exemplary embodiments, a film type speaker includes: a thin film vibrator in which a single vibrator unit including a mixed piezoelectric body formed by uniformly distributing PZT piezoelectric powder and a electrode formed on both sides or at least one side thereof is formed; At least one thin film vibrator is attached, and comprises a film diaphragm having an electrode for providing a voltage to the thin film vibrator.

The non-piezoelectric polymer may include one or more of urethane and polyester, and the mixed piezoelectric body may be composed of 65 to 70% of PZT powder, 9 to 20% of polyester or urethane, and 15 to 21% of a solvent.

Two or more thin film vibrators may be formed on the film diaphragm, and the number of single vibrator units constituting the plurality of thin film vibrators may be configured differently.

The film diaphragm may be disposed on both sides of the thin film vibrator, and may be bonded to the thin film vibrator to vibrate at the same time when the thin film vibrator vibrates, and the pair of film diaphragms may have electrodes.

In addition, the light emitting device and the electrode for supplying power to the surface on which the thin film oscillator of the film diaphragm is attached may be further configured.

Further, at least one thin film sensor having the same structure as the thin film vibrator may be attached to the film diaphragm, and the film diaphragm may further include an electrode connected to the thin film sensor.

According to another aspect of the present invention, there is provided a film-type speaker comprising: a thin film vibrator in which a single vibrator unit including a mixed piezoelectric body formed by uniformly distributing PZT piezoelectric powder and a electrode formed on both sides or at least one side thereof is formed; At least one thin film vibrator, and a first film diaphragm having an electrode for providing a voltage to the thin film vibrator; The second film diaphragm is attached to the at least one thin film vibrator while corresponding to the first film diaphragm, and has an electrode connected to the thin film vibrator.

According to another aspect of the present invention, there is provided a method of manufacturing a film speaker, including: a mixing step of dispersing PZT piezoelectric powder evenly in a non-piezoelectric polymer to form a piezoelectric mixture; Forming a piezoelectric mixture by forming the piezoelectric mixture, and forming an electrode on upper and lower portions of the mixed piezoelectric body and then polarizing the thin film vibrator; And a speaker forming step of preparing a film diaphragm having electrodes formed on the film having a larger area than the thin film vibrator and attaching the thin film vibrator to be connected to the electrodes of the film diaphragm.

According to an embodiment of the present invention, a film-type speaker and a method of manufacturing the same, a piezoelectric thin film is formed by mixing PZT powder, which is a piezoelectric material, with a non-piezoelectric polymer that can effectively transmit the vibration, and a unit vibrator having electrodes applied to upper and lower portions of the piezoelectric thin film. By manufacturing one or more laminated vibrators and attaching them to the film-shaped diaphragm electrode is formed to improve the volume and sound quality, reinforce the bass, there is an effect of increasing the yield of the manufacturing process.

According to an embodiment of the present invention, a film-type speaker and a method of manufacturing the same may be configured by forming a plurality of thin vibrators on a film-type diaphragm to freely design volume and speaker range characteristics, and various film-type diaphragm materials and thicknesses. It is easy to deform and test because the shape can be applied.

In the film type speaker and a method of manufacturing the same according to the embodiment of the present invention, the film type diaphragm is attached to the front and rear surfaces of the thin vibrator so that a plurality of diaphragms ring at the same time, thereby reinforcing bass and changing the phase to increase the volume. It is to provide a type speaker and a method of manufacturing the same.

According to an embodiment of the present invention, a film type speaker and a method of manufacturing the same are attached to at least one film type diaphragm with a thin vibrator interposed therebetween, and the electrodes provided to the thin type vibrator, and a thin light emitting part structure dispersedly disposed on the film type diaphragm. Therefore, there is an effect that a plurality of functions can be provided in the film type speaker structure.

According to an embodiment of the present invention, a film-type speaker and a method of manufacturing the same further include a thin sensor having the same or similar structure as the thin vibrator in the film-shaped diaphragm attached to the film-type diaphragm, and the thin sensor By providing an electrical signal according to the touch input to perform a control interface function, it is possible to provide a speaker that provides an efficient and new type of interface while minimizing process change.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

3 shows the configuration of the mixed piezoelectric member 50 according to the embodiment of the present invention, and as shown, the PZT piezoelectric powder 52 in the non-piezoelectric polymer 51 including polyester (or urethane). The piezoelectric mixture formed by mixing is formed in the form of a mixed piezoelectric body 50 through screen printing or a doctor blade.

In general, when only the PZT piezoelectric powder 52 is used, it is difficult to form a predetermined size or more because it is composed of a hard cured material and it is difficult to effectively form electrodes on the upper and lower parts thereof. There is a vulnerable limit.

Accordingly, when the PZT piezoelectric powder 52 is mixed with a non-piezoelectric polymer that can effectively transmit the piezoelectricity of the PZT piezoelectric powder itself, it is possible to form a piezoelectric material having flexibility.

In the case of the non-piezoelectric polymer, since the unit price is low, the mass production is high, and the mixed piezoelectric material has the same or superior performance as the existing piezoelectric elements, but the manufacturing cost thereof is significantly lowered. These piezoelectric composites must have a high dielectric constant and a low dielectric loss for frequency. When the polyester or urethane is applied to the non-piezoelectric polymer, the piezoelectric composite can be reduced in thickness and area. It exhibits stable dielectric loss over constant and frequency, and the leakage current is lowered, so that the piezoelectric properties can be realized to be superior to the case where the piezoelectric material is applied by mixing PZT powder with ceramic piezoelectric material or PVDF. In particular, unlike the O-3 type piezoelectric composite material based on Ba, the mixed piezoelectric material is easy to mold and has a low driving voltage of 50V or less and excellent piezoelectric properties.

4 illustrates a unit vibrator unit formed using the mixed piezoelectric body of FIG. 3, wherein electrodes 61 and 63 are formed above and below the mixed piezoelectric body 62. After forming the electrodes 61 and 63, polarization is performed so that piezoelectric characteristics are exhibited.

The unit vibrator unit may be stacked in plural as shown in FIG. 5, and may be sequentially formed while disposing the electrodes 63 and 65 between the plurality of mixed alloys 62, 64, and 66, and upper and lower portions thereof. The electrode 67 and the lower electrode 61 may be formed to form thin film vibrators of various stacked forms.

As the unit vibrator units are stacked in this manner, the piezoelectric characteristics may be improved, and thus the bass characteristics may be greatly improved.

6 illustrates various shapes of the thin film vibrator, and may have various shapes such as circular, circular lamination, square, trapezoidal lamination, and the like, as shown.

In order to effectively manufacture the configuration as described above, a wide piezoelectric film in which electrodes are formed by forming a mixed piezoelectric body in a film form and forming electrodes on the upper and lower sides thereof, and then punched into various shapes as shown in FIG. The vibrator can be manufactured.

7 shows a process of manufacturing the thin film vibrator as described above, as shown in the preparation of the PZT powder (S10), and preparing a non-piezoelectric polymer (S20) and then mixing them to make a piezoelectric mixture slurry (S30). . In this case, a uniform mixing of the dispersant may be performed for a predetermined time or more to disperse the PZT powder.

Such non-piezoelectric polymers include polyester and urethane, and when mixed with a solvent and a dispersant, desired viscosity, density, and dispersion characteristics can be obtained.

For example, when PZT powder (PbTiO3) is 65-70%, polyester or urethane 9-20t%, and solvent 15-21%, it is easy to print, piezoelectric properties, flexibility and electrode adhesion, simply PZT powder Compared with the case of using only, the piezoelectric properties are improved and flexibility can be formed to a desired size.

The composition slurry is formed in a desired thickness and shape through various methods such as printing (S40) or a doctor blade, and forms electrodes (S50) in the upper and lower portions of the mixed piezoelectric body thus formed. If necessary, it may be laminated in a plurality of layers. Thereafter, voltage is applied to the formed electrode and polarized (S60). Polarization can be carried out by known corona polarization or direct electric field application, and when forming a plurality of layers, it is preferable to polarize each layer and to make the polarization directions coincide.

Through the above process, a thin film oscillator can be formed, and in another way, a wide panel form can be formed through the above process, and then punched to make a desired shape in large quantities.

FIG. 8 is an example for explaining a method of implementing a substantially film type speaker by attaching the thin film vibrator 100 manufactured through the above-described method to the film 120 having the electrodes 121 and 122 formed thereon. As shown in FIG. The first electrode 121 and the upper electrode of the thin film vibrator 100 are connected to the outside by connecting the lower electrode of the thin film vibrator 100 to the outside from the region (dotted line) of the film 120 to be bonded. A second electrode 122 configured to extend is formed on the film 120. In order to electrically connect the upper electrode of the thin film vibrator 100 with the second electrode 122, a separate connection unit 110 may be configured.

The first electrode 121, the second electrode 122, and the film 120 may all be transparent, and although not shown, transparent / opaque electrodes may be formed in various forms.

The electrodes 121 and 122 may be configured using various conductive metals or conductive polymers. The electrodes 121 and 122 may be easily implemented by printing using a conductive polymer. In general, as the conductive polymer used as an electrode, conductive polymers such as polyaniline, polythiophene, PEDOT (poly (3,4-ethylene-dioxythiophene)), polypyrrole, PPV (polyphenylenevinylene), derivatives thereof, and organic conductors may be used. . In addition, you may use the paste which Ag and carbon powder mixed.

In the case of the film 120, the thin film vibrator 100 is attached and vibrated, thereby operating as a film diaphragm which performs a function of spreading and amplifying the vibration waveform.

On the other hand, the film 120 can be amplified while considering the volume and tone of the thin film vibrator 100 by varying the thickness, material, and the like. For example, the thickness of the film 120 may not be uniform so that a thin portion mainly amplifies the high range portion and a thick portion mainly amplifies the low range portion, and the thickness difference is mainly centered on the thin film vibrator 100. It may be configured radially or in rippled form.

9 illustrates an example in which the thin film vibrator 100 is attached to a film 120 having transparent electrodes 121 and 122 formed thereon, and the film 120 is tensioned and fixed to the frame 130. When the film 120 is tensioned and fixed to the frame 130, the film diaphragm made of the film 120 and the electrodes 121 and 122 may amplify the vibration of the thin film vibrator 100.

In the case of the film 120, the thickness, the electrode configuration, and the like can be freely modified, so that a design in consideration of desired acoustic characteristics is facilitated. For example, to change the thickness of the film 120, to change the tensile force, to change the arrangement of the constituent electrodes, to vary the thickness structure of the film, or to configure the shape of the film in various ways You can easily apply various tasks.

10 shows various examples of attaching a plurality of thin film vibrators 151 to 157 to a film used as a film diaphragm. The plurality of thin film vibrators may be configured to correspond to a single acoustic signal, and the arrangement thereof may be freely modified. can see. In this case, electrodes for driving the thin film vibrators 151 to 157 may be formed in various patterns and methods on the films 140, 141, and 142. Through this, various speaker configurations such as various sound effects or multi-channel support are possible, and the number of stacked thin film vibrators can be changed to reinforce both high and low sounds.

FIG. 11 illustrates an example in which the configuration of the film diaphragm is modified. As illustrated, examples of applying the plurality of film diaphragms to the front and rear surfaces of the thin film vibrator are shown. Note that the thin film vibrator 170 is substantially thin in thickness, but emphasized for convenience.

As shown in FIG. 11A, film diaphragms 161 and 162 having the same size are attached to the front and rear surfaces of the thin film vibrator 170, respectively. Of course, in some cases, the size and shape of the film diaphragm (161, 162) of the front and rear surfaces may be different, but in general, a plurality of film diaphragm vibrates in accordance with the vibration of the thin film vibrator 170, more stereoscopic sound Can be provided.

In particular, when the inner side is closed to close the sides of the film diaphragm (163, 164) as shown in Figure 11b, according to the vibration of the thin film vibrator 170, front and rear film diaphragm (163, 164) containing air Vibration of) can improve the overall bass characteristics by slightly lowering the characteristics of the treble and enhancing the characteristics of the bass.

On the other hand, the thickness of the plurality of film diaphragm may be applied equally, but in some cases may be formed with a different thickness, various sound adjustments are possible according to the application of the different thickness.

And, although not shown, if the space is configured as shown in the configuration of Figure 11b, in order to obtain a desired space structure for securing the space is further applied to the front and rear surfaces of the thin film oscillator 170 or a thick adhesive means is applied can do.

FIG. 11C illustrates an exploded perspective view of the plurality of film diaphragms 165 and 167 and the thin film vibrator 170. As illustrated, the individual film diaphragms 165 and 167 are directly connected to upper and lower electrodes of the thin film vibrator 170. The electrodes 166 and 168 may be formed to extend in contact with the thin film vibrator 170, respectively, thereby freeing the electrode configuration and eliminating the need for a separate electrode connection.

12 illustrates an example of a configuration for utilizing an empty space of a film diaphragm in which a thin film vibrator is disposed, and illustrates a case in which a light emitting unit is further configured in an empty space of the film diaphragm.

FIG. 12A illustrates a speaker in which a thin film vibrator 200 and a plurality of EL light emitting parts 210 are disposed on a film diaphragm 180. As shown, it can be seen that the electrode for operating the common electrode 181 and the thin film vibrator 200 and the electrodes 183 for operating each of the EL light emitting portions 210 are formed on the film diaphragm 180. have.

The EL light emitting unit 210 may be separately manufactured similarly to a thin film vibrator and may be configured to be attached to the film diaphragm 180. Instead of the EL light emitting unit 210, other types of light emitting units such as chip LEDs may be configured. May be

12B illustrates an example of the film diaphragm 185 to which the light emitting part 211 in the form of a logo or text is applied by modifying the light emitting part configuration, and FIG. 12C illustrates the film diaphragm 190 to which the light emitting part 212 having a specific pattern shape is applied. An example of this is shown.

Although not shown, a complex patterned light emitting part may be configured by printing on the film diaphragm of the portion to which the light emitting part is applied and then applying the light emitting part to the corresponding print area. Through this, it is possible to provide a thin film-shaped speaker that simultaneously provides audible sound and visual light, and because the electrode is configured on the film diaphragm, it is possible to provide excellent aesthetics when the electrode is transparently implemented. On the other hand, the application of the light emitting part to provide such a visual feature can be carried out on the same surface at the same time in the process of attaching the thin film vibrator, so that the increase of the process burden is not so large that a speaker that provides a complex effect at a relatively low cost will be mass produced. Can be.

FIG. 13 relates to another embodiment of the present invention, and illustrates a speaker system configuration when the thin film vibrator is additionally applied to a film diaphragm using a touch sensor to operate the same.

As shown in the figure, the thin film piezoelectric vibrator 310 is applied to the film diaphragm, and the thin film piezoelectric vibrator 310 is used as a means for generating sound, and the thin film piezoelectric vibrator 320 having the same structure is applied to the user's touch. It is utilized as a thin film sensor that generates a change in electrical signal.

The thin film piezoelectric vibrators described above not only vibrate when a voltage is applied, but also generate an electric field when pressure is applied.

Accordingly, a plurality of thin film piezoelectric vibrators 310 and 320 may be configured in the film diaphragm 300 so that one of them may be used for output and one of them may be used for input (in some cases, all of them may be used). It can be used for output or for input.) Sound output and interface means can be provided only by using a film-type speaker, thereby simplifying the appearance configuration of the speaker. This allows us to respond to recent design trends that require simple or minimalised products.

On the other hand, the process or process for implementing a film-type speaker having both input and output functions is the same as the single process of attaching a plurality of thin film piezoelectric vibrators (310, 320) to the film diaphragm 300, the electrode is formed for simple output It is possible to realize a multi-functional film speaker without increasing the number or parts.

In order to use the illustrated multi-functional film speaker, an audio output part including a transformer 222 for matching with an audio amplifier 221 for amplifying an audio signal as shown, and applied to the film speaker An amplifier 232 for amplifying an electrical signal generated from the thin film piezoelectric vibrator 320 acting as a thin film sensor, and after filtering the noise of the signal of the amplifier 232 to select the actual touch input to output as a logic signal A sensing part including the filter and the sensing unit 231 may be configured. Since the sensing part may be made of relatively simple devices, the cost of implementation is not high and the volume increase is not large.

FIG. 14 illustrates a structure of a film-type speaker 300 having a composite function in which the thin film vibrator 310, the light emitting unit 330, and the thin film sensor 320 are all applied to the film diaphragm 301. The thin film vibrator 310, the light emitting unit 330, and the thin film sensor 320 may be attached to the same surface of the film diaphragm 310 in which the electrode is formed in a single process, so that the yield is high, mass production is possible, and the process cost is not high.

However, although the amplification, volume increase, or sound quality improvement characteristics, which are basic functions of the film diaphragm 301, may be affected by these additional components, the arrangement of the light emitting unit 330 and the arrangement of the thin film sensor 320 may be affected. This effect can be minimized. Alternatively, an additional film diaphragm may be applied to change the arrangement of additional functional parts.

FIG. 15 illustrates an example of applying the configuration of FIG. 14. The film diaphragms 301 and 340 having the electrodes 302 and 342, respectively, are prepared so that the thin film vibrator 310 and the thin film sensor 320 are front. The film diaphragm 300 of the contact closely arranged, the light emitting unit 330 is placed in close contact with the rear film diaphragm 340 to slightly space them so that only the front film vibrating, or the thin film vibrator 310 and the rear film diaphragm After applying the spaced apart structure between the 340 may be to maintain the vibration characteristics of the front film diaphragm 301 by bonding.

In the above, certain preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art without departing from the gist of the present invention attached to the claims. .

1 is a cross-sectional view showing the configuration of a speaker.

2 is an exploded view showing the configuration of a film seeker;

3 is a cross-sectional view showing the configuration of a mixed piezoelectric body according to an embodiment of the present invention.

4 is a unit thin film vibrator configuration according to an embodiment of the present invention.

5 is a laminated thin film oscillator configuration according to an embodiment of the present invention.

6 is a structural example of a thin film vibrator according to an embodiment of the present invention.

7 is an example of a thin film vibrator manufacturing process according to an embodiment of the present invention.

8 is an example of the vibrating portion of the film-like speaker according to the embodiment of the present invention.

9 is a configuration example of a film speaker according to an embodiment of the present invention.

10 is a vibrating portion of the film-like speaker according to the embodiment of the present invention.

11 is a configuration example of the film diaphragm of the film speaker according to the embodiment of the present invention.

12 is an example of a light emitting function additional film type speaker structure according to an embodiment of the present invention.

Figure 13 is an example of the configuration of a sensor-type film-based speaker system according to an embodiment of the present invention.

14 is an example of a functional arrangement structure of a film-type speaker with an integrated function according to an embodiment of the present invention.

15 is an example of a film type speaker structure with an integrated function according to an embodiment of the present invention.

** Description of symbols for the main parts of the drawing **

100: thin film oscillator 120: film diaphragm

121, 122: electrode 130: frame

Claims

Film type speaker according to an embodiment of the present invention

A thin film vibrator in which a single vibrator unit comprising a mixed piezoelectric body formed by uniformly distributing PZT piezoelectric powder in a non-piezoelectric polymer and electrodes formed on both sides or at least one side thereof;

At least one thin film vibrator is attached, characterized in that it comprises a film diaphragm having an electrode for providing a voltage to the thin film vibrator.

The film type speaker of claim 1, wherein the non-piezoelectric polymer comprises at least one of polyester and urethane.

The film type speaker of claim 1, wherein the mixed piezoelectric material is at least three times more mixed with PZT powder than the non-piezoelectric polymer.

The film type speaker of claim 1, wherein the thin film vibrator has electrodes formed between the plurality of mixed piezoelectrics and at the top and bottom thereof, and the bottom and top electrodes are used as the bottom and top electrodes, respectively.

The film type speaker of claim 1, wherein two or more thin film oscillators are formed on the film diaphragm.

The film type speaker according to claim 5, wherein the number of single vibrator units constituting the plurality of thin film vibrators is different.

The film type speaker according to claim 1, wherein the film diaphragms are arranged in pairs on both sides of the thin film vibrator and are respectively bonded to the thin film vibrators to vibrate simultaneously when the thin film vibrator vibrates.

The film type speaker according to claim 7, wherein electrodes are formed on the pair of film diaphragms.

The film type speaker according to claim 7, wherein the pair of film diaphragms are bonded at each side to seal the inside thereof.

The film type speaker of claim 1, further comprising a light emitting device configured on a surface to which the thin film vibrator of the film diaphragm is attached, wherein the film diaphragm further includes an electrode for supplying power to the light emitting device.

The film type speaker of claim 1, wherein at least one thin film sensor having the same structure as the thin film vibrator is attached to the film diaphragm, and the film diaphragm further comprises an electrode connected to the thin film sensor.

At least one thin film vibrator, and a first film diaphragm having an electrode for providing a voltage to the thin film vibrator;

And a second film diaphragm corresponding to the first film diaphragm and attached to the at least one thin film vibrator and having an electrode connected to the thin film vibrator.

The film type speaker of claim 12, wherein a space between the first film diaphragm and the second film diaphragm is sealed.

The display apparatus of claim 12, further comprising a light emitting part added to at least one of the first film diaphragm and the second film diaphragm, wherein at least one of the first film diaphragm and the second film diaphragm is connected to the light emitting part. Film-type speaker, characterized in that formed.

The film type speaker of claim 12, wherein the thin film vibrator is formed in plural, and at least one of them is used as a sensor for sensing an input.

Mixing the PZT piezoelectric powder evenly in the non-piezoelectric polymer to form a piezoelectric mixture;

Forming a piezoelectric mixture by forming the piezoelectric mixture, and forming an electrode on upper and lower portions of the mixed piezoelectric body and then polarizing the thin film vibrator;

And a speaker forming step of preparing a film diaphragm having electrodes formed on the film having a larger area than the thin film vibrator and attaching the thin film vibrator to be connected to the electrodes of the film diaphragm.

The method of claim 16, wherein in the mixing step, the non-piezoelectric polymer comprises at least one of polyester and urethane.

The method of claim 16, wherein in the mixing step, the mixed piezoelectric material is 65 to 70% of PZT powder, 9 to 20% of urethane or polyester, and 15 to 21% of a solvent.

The method according to claim 16, wherein the thin film vibrator manufacturing step further comprises the step of forming a mixed piezoelectric material in the form of a film, and forming an electrode on the upper and lower portions of the thin film oscillator by punching it in a desired form Speaker manufacturing method.

The method of claim 16, wherein in the speaker forming step, a plurality of thin film vibrators are attached to the film diaphragm.

The method of claim 16, wherein in the speaker forming step, a pair of film diaphragms are attached to both sides of the thin film vibrator so that the thin film vibrator vibrates so as to vibrate at the same time.

The method of claim 16, further comprising a light emitting element and an electrode connected to the light emitting element on the film diaphragm.

The method of claim 16, wherein in the speaker forming step, the film diaphragm further comprises the step of attaching at least one thin film sensor having the same structure as the thin film vibrator in the same process as the thin film vibrator, wherein the film diaphragm is the thin film Film-type speaker manufacturing method characterized in that the electrode connected to the sensor further configured.