TWI491271B - Thin speaker with piezoelectric ceramic fiber composite and manufacturing method thereof - Google Patents

Description

Piezoelectric ceramic fiber composite thin horn and manufacturing method thereof

The present invention relates to a thin speaker, and more particularly to a piezoelectric ceramic fiber composite thin with acoustic quality, wide range, frequency adjustable control and low frequency response enhancement. Speaker (thin speaker).

Sound and video are the main communication mediums for electronic devices and users. Especially in the sound part, from movies and TV, radio, walkman to smart phones, high-quality image and sound output has always been an important direction of technology development. In particular, with the continuous innovation of the functions of portable intelligent electronic products, under the trend of continuously reducing the size and weight of the products, the quality of audio and video output is more important. However, advances in technology have made great strides in the display image segment, but limited by the limited size of consumer portable smart electronic products. The size of high-quality speakers is too large to be built-in for voice use or poor sound output. Electroacoustic components cannot meet the quality requirements for playing music. High-quality sound or music still depends on an external speaker to achieve a wide range of 0.2 to 20 kHz.

The operation mode of the horn is generally three types including moving coil, piezoelectric and static electricity (or electret). Among them, the "piezoelectric horn" uses a piezoelectric ceramic sheet as an electromechanical conversion source. When an electric field is applied, the piezoelectric ceramic sheet can be driven to generate mechanical deformation, and the diaphragm is driven to make sound. The piezoelectric material is a highly rigid ceramic material, and the vibration generated by the combination of the diaphragm is not conducive to the performance of the low range. Therefore, some patents are designed in the structure to make the bass field reach by using an external platform or a volumetric object as a speaker. Improvement, but it is a portable external speaker design, can not be integrated into thin electronic products.

In addition, piezoelectric horns can improve the bass response by reducing the thickness of the piezoelectric ceramics, such as U.S. Patent 7,590,235. However, it is not limited to the fragile nature of ceramics, and it is difficult to fabricate piezoelectric ceramic sheets having a sufficiently thin thickness. Therefore, there has been a development of a multilayer structure to improve the fragility of ceramic sheets, such as US Patent Publication No. US20030099371, although the sound pressure can be multi-layered. The superposition effect increases, but the improvement of the response of the low range is still insufficient. The low range of the low range is still sufficient at around 1 kHz, and the performance of the low range still has considerable room for improvement.

In addition, since the rigidity of the piezoelectric ceramic can be lowered to improve the characteristics of low audio, there is also a patent such as US Patent Publication No. US20100150381 which uses polyvinylidene difluoride (PVDF) and lead zirconate titanate (PZT) piezoelectric ceramic powder. The compounding material formed by mixing the resin and the piezoelectric ceramic powder has the low rigidity but loses the electromechanical conversion characteristics of the piezoelectric material, resulting in a decrease in the output volume.

The invention provides a piezoelectric ceramic fiber composite thin speaker capable of improving music quality, frequency adjustment control and improving low frequency response.

The invention provides a manufacturing method of a piezoelectric ceramic fiber composite thin horn, which can easily produce a thin horn with good sound quality, wide sound range and suitable for miniaturization.

The invention provides a piezoelectric ceramic fiber composite thin horn, comprising a piezoelectric ceramic fiber composite actuator composed of a crosslinked solidified colloid and a plurality of piezoelectric elements and at least one diaphragm. The diaphragm is located on one or both sides of the piezoelectric ceramic fiber composite actuator.

In an embodiment of the invention, the piezoelectric ceramic fiber composite actuator has a Young's modulus ranging from 0.1 GPa to 10 GPa, preferably from 3 GPa to 5 GPa, and the actuator still requires a certain strength of rigidity to mechanically Can be effectively transmitted to the diaphragm.

In an embodiment of the invention, the diaphragm has a Young's modulus in the range of 0.1 GPa to 3.5 GPa, preferably 2 GPa to 3.5 GPa.

In an embodiment of the invention, each piezoelectric unit is a piezoelectric ceramic fiber. The composition of the piezoelectric ceramic fiber is expressed as ABO ₃ , where A represents lead (Pb), barium (Ba), barium (La), strontium (Sr), potassium (K) or lithium (Li); B represents titanium ( Ti), zirconium (Zr), manganese (Mn), cobalt (Co), niobium (Nb), iron (Fe), zinc (Zn), magnesium (Mg), yttrium (Y), tin (Sn), nickel ( Ni) or tungsten (W). The piezoelectric ceramic fiber has a wire diameter in the range of 20 μm to 1000 μm, preferably 100 μm to 300 μm. The piezoelectric ceramic fiber is added in an amount ranging from 60 vol% to 92 vol%, and a preferred addition amount is from 80 vol% or more to 92 vol%.

In an embodiment of the invention, the piezoelectric ceramic fiber composite actuator has an area of 0.5 cm ² to 25 cm ² , and a preferred composite actuator area is 5 cm ² or more to 25 cm ² .

In an embodiment of the invention, the piezoelectric ceramic fiber composite actuator has a thickness in the range of 30 μm to 300 μm, preferably 70 μm to 120 μm.

In one embodiment of the present invention, the crosslinked cured colloid is a polymer selected from the group consisting of an epoxy resin, an acrylic resin, and a phenol resin.

In an embodiment of the invention, the piezoelectric ceramic fiber composite actuator is circular, elliptical or rectangular.

In an embodiment of the invention, the diaphragm further includes an electrode layer, wherein the material of the electrode layer comprises gold (Au), platinum (Pt), silver (Ag), silver palladium (Ag-Pd), aluminum (Al) Or copper (Cu). The thickness of the electrode layer ranges from 0.1 μm to 10 μm, preferably from 0.5 μm to 1 μm.

In an embodiment of the invention, the diaphragm is selected from the group consisting of polycarbonate (PC), polyethylene terephthalate (PET) and polyimide (PI). A material in a group of people.

In an embodiment of the invention, the diaphragm has a thickness in the range of 15 μm to 150 μm, preferably 100 μm or less to 15 μm.

In an embodiment of the invention, the diaphragm is circular or rectangular in shape.

In one embodiment of the present invention, the area of the diaphragm in the range of 1cm ² ~ 250cm ^2, the ratio of the area of the actuator diaphragm area will be preferred sound field performance at about 2 to 5, the diaphragm more The preferred area ranges from 10 cm ² to 125 cm ² .

The invention further provides a manufacturing method of a piezoelectric ceramic fiber composite thin horn, which comprises first arranging piezoelectric ceramic fibers, and then bonding the piezoelectric ceramic fibers with a cross-linking curing colloid and curing the cross-linked curing colloid to form a Piezoelectric ceramic fiber composite. Next, the piezoelectric ceramic fiber composite is cut to obtain a plurality of composite sheets. Then, the polarized composite sheet is used as a piezoelectric ceramic fiber composite actuator, and the diaphragm is attached to one or both sides of the piezoelectric ceramic fiber composite actuator.

In another embodiment of the invention, the step of cutting the piezoelectric ceramic fiber composite comprises cutting at an angle of the vertical piezoelectric ceramic fiber.

In another embodiment of the present invention, the electrode layer may be formed on the surface of the diaphragm before the diaphragm is attached.

In another embodiment of the invention, the method of forming the electrode layer described above includes vacuum sputtering or printing.

Based on the above, the piezoelectric ceramic fiber composite material is used as an actuator, so the thin piezoelectric composite material speaker has high response (>90 dB) in low audio (200~1 kHz) and can be extended to high audio (~20 kHz). And because of its simple structure and ultra-thin (<0.5mm), it is easy to integrate with portable products. It has also been tested to achieve a low distortion rate (~10%). Therefore, the horn of the present invention is superior in comparison to a conventional piezoelectric ceramic speaker in terms of acoustic characteristics or volume, and has a low driving voltage.

The above described features and advantages of the present invention will be more apparent from the following description.

1 is a perspective perspective view of a piezoelectric ceramic fiber composite thin horn according to an embodiment.

Referring to FIG. 1, the piezoelectric ceramic fiber composite thin horn 100 of the present embodiment includes a diaphragm 102 and a piezoelectric ceramic fiber composite actuator 104. The Young's modulus of the piezoelectric ceramic fiber composite actuator 104 is, for example, 0.1 GPa to 10 GPa, preferably 3 GPa to 5 GPa, and the diaphragm 102 located on one side of the piezoelectric ceramic fiber composite actuator 104. The Young's coefficient ranges, for example, from 0.1 GPa to 3.5 GPa, preferably from 2 GPa to 3.5 GPa. The piezoelectric ceramic fiber composite actuator 104 is composed of a crosslinked cured colloid 106 and a plurality of piezoelectric elements 108, wherein each piezoelectric unit 108 is a piezoelectric ceramic fiber, and its composition is expressed as ABO _{3 .} A represents an element such as Pb, Ba, La, Sr, K, and Li; and B represents an element such as Ti, Zr, Mn, Co, Nb, Fe, Zn, Mg, Y, Sn, Ni, and W. Since the ratio of the ceramic phase in the piezoelectric ceramic composite is high, the electromechanical conversion efficiency can be higher than that of the all-piezoelectric ceramic material by more than 10%, so the piezoelectric ceramic fiber can be added in an amount of 60 vol% to 92 vol%. It is preferably 80 vol% to 92 vol% for better electromechanical conversion efficiency and lower rigidity and mass ratio. The piezoelectric ceramic fiber has a wire diameter ranging from 20 μm to 1000 μm, preferably from 100 μm to 300 μm. The crosslinked cured colloid 106 is, for example, selected from the group consisting of an epoxy resin, an acrylic resin, and a novolak resin.

With reference to FIG. 1, the piezoelectric ceramic fiber composite actuator 104 of the present embodiment has an area of, for example, 0.5 cm ² to 25 cm ² and a thickness ranging from 30 μm to 300 μm, preferably in an area of 5 cm ² ~ 25 cm ² and a thickness ranging from 70 μm to 120 μm. The diaphragm 102 may be an organic or organic-inorganic composite comprising two or more different Young's coefficients, such as selected from the group consisting of polycarbonate (PC) and polyethylene terephthalate ( Polyethylene terephthalate (PET) is a material of the group consisting of polyimine (PI). Further, the thickness of the diaphragm 102, for example, between 15μm ~ 150μm, the area range, for example between 1cm ² ~ 250cm ^2, preferably the diaphragm 102 in the thickness 15μm ~ 100μm, the area of the diaphragm 102 and the actuator 104 area The ratio of 2 to 5 has a better sound field performance, and the preferred diaphragm 102 has an area ranging, for example, between 10 cm ² and 125 cm ² . In addition, the electrode layer 110 may be further included on the attachment surface and the opposite surface of the diaphragm 102 and the piezoelectric ceramic fiber composite actuator 104, and the material thereof may include Au, Pt, Ag, Ag-Pd, Al, Cu, or the like. The thickness of the electrode layer 110 ranges, for example, between 0.1 μm and 10 μm, and the thickness of the preferred electrode layer 110 ranges from 0.5 μm to 1 μm.

In Fig. 1, the piezoelectric ceramic fiber composite actuator 104 is rectangular; the diaphragm 102 is also rectangular in shape. However, the present invention is not limited thereto, and the piezoelectric ceramic fiber composite actuator 104 of the present embodiment may also be circular (as shown in Fig. 2) or elliptical. Similarly, the shape of the diaphragm 102 may also be circular (as in FIG. 2) or other shapes, and the shape of the diaphragm 102 and the piezoelectric ceramic fiber composite actuator 104 may be the same or different.

3 is a perspective perspective view of a piezoelectric ceramic fiber composite thin horn according to another embodiment, in which the same reference numerals are used to denote the same members.

Referring to FIG. 3, the piezoelectric ceramic fiber composite thin horn 300 of the present embodiment has a first vibration on both sides of the piezoelectric ceramic fiber composite actuator 104 in addition to the piezoelectric ceramic fiber composite actuator 104. The membrane 302 and the second diaphragm 304. The material, thickness, area, and the like of the first diaphragm 302 and the second diaphragm 304 can be referred to the embodiment of FIG. 1 .

In each of the above figures, the piezoelectric ceramic fiber composite actuator 104 is a composite material belonging to a 1 (piezoelectric ceramic fiber)-3 (hardened colloid) structure; that is, a piezoelectric unit 108 (piezoelectric ceramic) therein. The fibers have the same directional alignment, and the crosslinked curing colloid 106 is enclosed between the piezoelectric units 108, that is, the organic material is bonded to the isotropically arranged piezoelectric ceramic fibers to achieve a high ceramic phase (>60%). Compound material. Therefore, in addition to the drawings of the above embodiments, FIGS. 4A and 4B can be applied to the piezoelectric ceramic fiber composite actuator 104. 4A is a composite material composed of a crosslinked solidified colloid 400 and piezoelectric ceramic balls 402. 4B is a composite material composed of a crosslinked cured colloid 400 and a piezoelectric ceramic block 404. In addition to the composite material of the 1-3 structure shown in the drawings, the present invention should be applicable to other types of composite materials, and is not limited thereto.

FIG. 5 is a flow chart showing the manufacturing process of a piezoelectric ceramic fiber composite thin horn according to still another embodiment.

Referring to FIG. 5, first, the piezoelectric ceramic fibers are arranged and bundled in step S500, wherein the composition of the piezoelectric ceramic fibers used is expressed as ABO ₃ , and A represents lead (Pb), barium (Ba), and barium (La). , strontium (Sr), potassium (K) or lithium (Li); B represents titanium (Ti), zirconium (Zr), manganese (Mn), cobalt (Co), niobium (Nb), iron (Fe), zinc ( Zn), magnesium (Mg), yttrium (Y), tin (Sn), nickel (Ni) or tungsten (W). The piezoelectric ceramic fiber has a wire diameter of about 20 μm to 1000 μm, preferably 100 μm to 300 μm.

Then, in step S502, the piezoelectric ceramic fiber is bonded with a crosslinked solidified colloid and the crosslinked solidified colloid is cured to form a low Young's modulus (about 0.1 GPa to 10 GPa, preferably 3 GPa to 5 GPa). Piezoelectric ceramic fiber composite. The crosslinked cured colloid is, for example, a polymer selected from the group consisting of an epoxy resin, an acrylic resin, and a phenol resin. The piezoelectric ceramic fiber is added in an amount of about 60 vol% to 92 vol%, preferably 80 vol% or more to 92 vol%, based on the volume of the crosslinked solidified colloid and the piezoelectric ceramic fiber.

Next, the piezoelectric ceramic fiber composite is cut in step S504 to obtain a plurality of composite sheets. In the present embodiment, step S504 is, for example, cutting at an angle of a vertical piezoelectric ceramic fiber. After step S504, the composite sheet may also be ground to obtain a thinner or finer shape.

Thereafter, the composite sheet is polarized in step S506 to be used as a piezoelectric ceramic fiber composite actuator.

Then, in step S508, the diaphragm is attached to one side or both sides of the piezoelectric ceramic fiber composite actuator, wherein the Young's modulus of the diaphragm is about 0.1 GPa to 3.5 GPa, preferably 2 GPa to 3.5 GPa. The diaphragm is, for example, selected from the group consisting of polycarbonate (PC), polyethylene terephthalate (PET), and polyamidamine (PI). In addition, an electrode layer may be formed on the surface of the diaphragm before the step S508 by a method such as vacuum sputtering or printing. The material of the above electrode layer is, for example, Au, Pt, Ag, Ag-Pd, Al or Cu.

Several experiments are listed below to verify the effects of the present invention.

Example one

First, a composite rod of different piezoelectric ceramic fibers is prepared, and the composite material containing piezoelectric ceramic fibers is 53 vol%, 72 vol%, 80 vol%, and 85 vol%.

The piezoelectric ceramic fiber was first bundled into a mold having an area of 5 cm ² , and the piezoelectric ceramic fiber used had a wire diameter of 250 μm and a length of 10 cm. Then, a suitable hardenable cross-linking curing colloid is prepared. After the epoxy resin is filled into the mold, a centrifugal and pumping step is applied, and after the colloid hardening and demoulding, an inorganic material having an isotropic arrangement of piezoelectric ceramic fibers is obtained. A composite of ceramic and organic colloid. Then, the above composite material is cut at an angle of a vertical fiber and polarized to obtain an ultrathin piezoelectric composite material sheet as an actuator for driving the horn diaphragm. The thickness of the piezoelectric ceramic fiber composite actuator is 70 μm, and the area is fixed. 5cm ² .

In addition, a conventional all-piezoceramic actuator was prepared having an area of 5 cm ² and a thickness of 70 μm.

Then, the composite properties of the above samples were measured, and the results are shown in Table 1 below. In Table 1, the Young's modulus (Y ₃₃ ) of the piezoelectric ceramic fiber composite actuator is significantly 2 to 3 orders of magnitude smaller than that of the conventional all-piezoelectric ceramic.

Then, a single layer PET diaphragm was attached to these piezoelectric ceramic fiber composite actuators to test the audio response. Among them, the area of the PET diaphragm was fixed to 25 cm ² and the thickness was 100 μm. The overall horn has a frame thickness of approximately 0.5 mm. The audio response results are shown in Figure 6, and the test conditions are 15V-10cm.

It can be seen from Fig. 6 that the horn starting frequency f ₀ of a piezoelectric ceramic fiber composite actuator with a different piezoelectric ceramic fiber addition amount attached to a single-layer diaphragm is about 200 to 215 Hz, and the sound pressure level is sound pressure level. , SPL) increases proportionally with the increase of the amount of piezoelectric ceramic fiber in the composite material. When the amount of piezoelectric ceramic fiber in the composite material is up to 85%, the response of the starting frequency f ₀ reaches 105 dB.

Moreover, the results of total harmonic distortion (THD) are shown in Fig. 7, which shows that the audible audio range (200 Hz to 10 kHz) is more than 10%.

Example two

The piezoelectric ceramic fiber composite material with 85% piezoelectric ceramic fiber added in Table 1 is used as an actuator, and then a diaphragm is attached to both sides of the piezoelectric ceramic film, and the center of the two layers of the diaphragm is followed by the composite sheet. The remaining spaces of the two layers of diaphragm are independent. The attaching surface of the diaphragm has an electrode layer, and the piezoelectric ceramic fiber composite thin horn of FIG. 3 is fixed by a fixed structural frame around the diaphragm. Wherein the lower diaphragm 100μm thickness PET film, fixed area of 25cm ^2; the diaphragm is Kapton (PI) film thickness of 25μm, respectively, the area 20cm ^2, 12.5cm ² and 6.25cm ² (on the diaphragm and The area ratio of the lower diaphragm is 0.8, 0.5 and 0.25, respectively. The overall horn has a frame thickness of approximately 0.5 mm and a test condition of 15 V to 10 cm.

As the area of the upper diaphragm changes, the effects of the audio response of the different speakers are measured. As a result, as shown in FIG. 8, the piezoelectric ceramic fiber composite material is laminated with a double-layer diaphragm, and the horn vibration frequency f _{0 is} about 230 Hz, and the response is 95 dB. At about 350 Hz, there is also a resonance frequency f ₀ ', and the response is 93 dB. The results show that a single double-layer diaphragm is used to fit a single piezoelectric composite sheet, and each has its own independent starting frequency in the low range.

The results of Total Harmonic Distortion (THD) are shown in Figure 9, which shows that the audible audio range (200 Hz to 10 kHz) is also mostly below 10%.

It can be obtained from the first example and the second example. Whether the single-layer diaphragm or the double-layer diaphragm, the horn vibration frequency f ₀ using the piezoelectric ceramic fiber composite as the actuator can be as low as 200 Hz to 230 Hz, and the response Then at least about 95dB.

Example three

In addition to changing the size of the upper diaphragm (the area ratio of the upper diaphragm to the lower diaphragm), the same structure and experimental conditions as in the second example were used to study the oscillation frequency and the corresponding sound pressure response level relationship. The results are shown in Fig. 10. .

As can be seen from Fig. 10, the oscillation frequency before the area ratio of the upper and lower diaphragms is 0.9 is less than 350 Hz, and the response is also 90 dB or more.

Example four

The test was carried out under the same structure and experimental conditions as in Example 2, except that the lower diaphragm was a Kapton PI film having a thickness of 100 μm. As a result, as shown in FIG. 11, as the area of the upper diaphragm changes, the response of the piezoelectric ceramic fiber composite thin horn from 200 Hz to 20 kHz is approximately 90 dB or more.

The starting frequency of the piezoelectric ceramic fiber composite thin horn of the above examples 1-4 is significantly lower than that of the all-piezoceramic horn (f ₀ ~ 1000 Hz 95 dB@, L × W × H 30 mm × 15 mm × 3 mm). The results show that the use of a single piezoelectric ceramic fiber composite actuator and a thin horn combined with a single or double diaphragm can significantly reduce the resonant frequency of the horn, and the response is maintained above 90dB and extends to the high range. In addition, the thinness of the volume advantage and the microminiaturized drive circuit make it very easy to be embedded in portable mobile consumer products, such as mobile phones, mp3, PDA or notebooks, which can provide better communication quality for intelligent communication products. .

Example 5: Flexibility Verification

A piezoelectric ceramic fiber composite material having a piezoelectric ceramic fiber addition amount of 85% in Table 1 was used as a sample, and the crosslinked solidified colloid used was an epoxy resin. Then, the flexible angles of the piezoelectric ceramic fiber composites of different thicknesses were measured, and the following Table 2 was obtained. As can be seen from Table 2, the piezoelectric ceramic fiber actuator obtained according to the examples has flexibility.

Example 6: Effect of diaphragm thickness ratio on sound pressure response level

A piezoelectric ceramic fiber composite thin horn having an area ratio of 0.8 was used in Example 4, but the thickness of the lower diaphragm was changed to 100 μm, 50 μm, and 25 μm, and then the starting frequencies of the three types of horns were measured, respectively, 230 Hz, 275 Hz, and 286 Hz. The relationship between the diaphragm thickness ratio and the sound pressure response level (dB) is shown in Fig. 12.

Example 7: Effect of actuator thickness on sound pressure response level

A piezoelectric ceramic fiber composite thin horn having an area ratio of 0.8 was used in Example 4, but the actuator thicknesses were 30 μm, 70 μm, and 100 μm, respectively, and then the starting frequencies of the three types of horns were measured, respectively, 315 Hz, 230 Hz, and 372 Hz. The relationship between the actuator thickness and the sound pressure response level (dB) is shown in FIG.

From the results of Example 6 and Example 7 above, it can be seen that the response of the piezoelectric ceramic fiber composite thin horn can be maintained above 90 dB.

In summary, the piezoelectric ceramic fiber composite thin speaker of the present invention has the simple structure and thinness of the piezoelectric ceramic horn, and the characteristics of low frequency response, so that it has a competitive advantage over the existing speaker, and is advantageous for wide-range thin type. The product development of the small speaker can effectively solve the problem that the portable audio products need to be built-in music-grade speakers.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100,300‧‧‧ Piezoelectric ceramic fiber composite thin speaker

102, 302, 304‧‧ ‧ diaphragm

104‧‧‧ Piezoelectric Ceramic Fiber Composite Actuator

106, 400‧‧‧ crosslinked solidified colloid

108‧‧‧Piezo unit

110‧‧‧electrode layer

402‧‧‧ Piezoelectric ceramic ball

404‧‧‧ Piezoelectric ceramic block

S500~S508‧‧‧Steps

1 is a perspective perspective view of a piezoelectric ceramic fiber composite thin horn according to an embodiment.

Fig. 2 is a modification of Fig. 1;

3 is a perspective perspective view of a piezoelectric ceramic fiber composite thin horn according to another embodiment.

4A and 4B are perspective views of two different piezoelectric ceramic fiber composite actuators.

FIG. 5 is a flow chart showing the manufacturing process of a piezoelectric ceramic fiber composite thin horn according to still another embodiment.

Fig. 6 is a graph showing the audio response of the horn of the different piezoelectric ceramic fibers added in the first example.

Fig. 7 is a graph showing the total harmonic distortion of the horn of the different piezoelectric ceramic fibers added in Example 1.

Figure 8 is a graph showing the audio response of a piezoelectric ceramic fiber composite thin horn with different upper and lower diaphragm area ratios of Example 2.

Figure 9 is a graph showing the total harmonic distortion of a piezoelectric ceramic fiber composite thin horn having different upper and lower diaphragm area ratios of Example 2.

Figure 10 is a graph of different upper and lower diaphragm area ratios, and the starting frequency and audio response of Example 3.

Figure 11 is a graph showing the audio response of a piezoelectric ceramic fiber composite thin horn having different upper and lower diaphragm area ratios of Example 4.

Figure 12 is a graph showing the relationship between the film thickness ratio of Example 6 and the sound pressure response level.

Figure 13 is a graph of actuator thickness versus sound pressure response level for Example 7.

100. . . Piezoelectric ceramic fiber composite thin speaker

102. . . Diaphragm

104. . . Piezoelectric ceramic fiber composite actuator

106. . . Crosslinked solidified colloid

108. . . Piezoelectric unit

110. . . Electrode layer

Claims (30)

A piezoelectric ceramic fiber composite thin horn comprises: a piezoelectric ceramic fiber composite actuator, which is composed of a plurality of piezoelectric units and a crosslinked solid colloid coated between the piezoelectric units, wherein Each piezoelectric unit is a single piezoelectric ceramic fiber; and at least one diaphragm is located on one or both sides of the piezoelectric ceramic fiber composite actuator. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the piezoelectric ceramic fiber composite actuator has a Young's modulus ranging from 0.1 GPa to 10 GPa. The piezoelectric ceramic fiber composite thin horn according to claim 2, wherein the piezoelectric ceramic fiber composite actuator has a Young's modulus ranging from 3 GPa to 5 GPa. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the at least one diaphragm has a Young's modulus ranging from 0.1 GPa to 3.5 GPa. The piezoelectric ceramic fiber composite thin horn according to claim 4, wherein the at least one diaphragm has a Young's modulus ranging from 2 GPa to 3.5 GPa. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the composition of the piezoelectric ceramic fiber is represented by ABO ₃ , wherein A represents lead, bismuth, antimony, bismuth, potassium or lithium; and B represents titanium, Zirconium, manganese, cobalt, ruthenium, iron, zinc, magnesium, bismuth, tin, nickel or tungsten. Piezoelectric ceramic fiber composite as described in claim 1 A thin horn, wherein the piezoelectric ceramic fiber has a wire diameter ranging from 20 μm to 1000 μm. The piezoelectric ceramic fiber composite thin horn according to claim 7, wherein the piezoelectric ceramic fiber has a wire diameter ranging from 100 μm to 300 μm. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the piezoelectric ceramic fiber is added in an amount ranging from 60 vol% to 92 vol%. The piezoelectric ceramic fiber composite thin horn according to claim 9, wherein the piezoelectric ceramic fiber is added in an amount ranging from 80 vol% to 92 vol%. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the piezoelectric ceramic fiber composite actuator has an area of 0.5 cm ² to 25 cm ² . The piezoelectric ceramic fiber composite thin horn according to claim 11, wherein the piezoelectric ceramic fiber composite actuator has an area of 5 cm ² to 25 cm ² . The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the piezoelectric ceramic fiber composite actuator has a thickness ranging from 30 μm to 300 μm. The piezoelectric ceramic fiber composite thin horn according to claim 13, wherein the piezoelectric ceramic fiber composite actuator has a thickness ranging from 70 μm to 120 μm. Piezoelectric ceramic fiber composite as described in claim 1 A thin horn, wherein the crosslinked cured colloid is a polymer selected from the group consisting of epoxy resin, acrylic resin and phenolic resin. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the piezoelectric ceramic fiber composite actuator is circular, elliptical or rectangular. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the diaphragm further comprises an electrode layer. The piezoelectric ceramic fiber composite thin horn according to claim 17, wherein the material of the electrode layer comprises gold, platinum, silver, silver palladium, aluminum or copper. The piezoelectric ceramic fiber composite thin horn according to claim 17, wherein the electrode layer has a thickness ranging from 0.1 μm to 10 μm. The piezoelectric ceramic fiber composite thin horn according to claim 19, wherein the electrode layer has a thickness ranging from 0.5 μm to 1 μm. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the at least one diaphragm is selected from the group consisting of polycarbonate, polyethylene terephthalate and polyamidamine. One of the materials. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the at least one diaphragm has a thickness ranging from 15 μm to 150 μm. The piezoelectric ceramic fiber composite thin horn according to claim 22, wherein the at least one diaphragm has a thickness ranging from 15 μm to 100 μm. Piezoelectric ceramic fiber composite as described in claim 1 A thin horn, wherein the at least one diaphragm is circular or rectangular in shape. The piezoelectric ceramic fiber composite thin horn according to claim 1, wherein the at least one diaphragm has an area ranging from 1 cm ² to 250 cm ² . The piezoelectric ceramic fiber composite thin horn according to claim 25, wherein the at least one diaphragm has an area ranging from 10 cm ² to 125 cm ² , and an area of the at least one diaphragm and an area of the actuator The ratio is between 2 and 5. A piezoelectric ceramic fiber composite thin horn manufacturing method for manufacturing a piezoelectric ceramic fiber composite thin horn according to any one of claims 1 to 26, the method comprising: a plurality of piezoelectric ceramic fibers Aligning the bundles; bonding the piezoelectric ceramic fibers with a cross-linking curing colloid and curing the cross-linked solidified colloid to form a piezoelectric ceramic fiber composite material; cutting the piezoelectric ceramic fiber composite material to obtain a plurality of composite material sheets Polarizing at least one composite sheet as a piezoelectric ceramic fiber composite actuator; and bonding the diaphragm to one or both sides of the piezoelectric ceramic fiber composite actuator. The method of manufacturing a piezoelectric ceramic fiber composite thin horn according to claim 27, wherein the step of cutting the piezoelectric ceramic fiber composite comprises cutting at an angle perpendicular to the piezoelectric ceramic fibers. The method for manufacturing a piezoelectric ceramic fiber composite thin horn according to claim 27, wherein before the aligning the diaphragm, the method further comprises: The surface of the diaphragm forms an electrode layer. The method of manufacturing a piezoelectric ceramic fiber composite thin horn according to claim 29, wherein the method of forming the electrode layer comprises vacuum sputtering or printing.