WO2007138844A1 - 弾性波装置 - Google Patents
弾性波装置 Download PDFInfo
- Publication number
- WO2007138844A1 WO2007138844A1 PCT/JP2007/059835 JP2007059835W WO2007138844A1 WO 2007138844 A1 WO2007138844 A1 WO 2007138844A1 JP 2007059835 W JP2007059835 W JP 2007059835W WO 2007138844 A1 WO2007138844 A1 WO 2007138844A1
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- WIPO (PCT)
- Prior art keywords
- film
- frequency
- temperature characteristic
- piezoelectric substrate
- wave device
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02834—Means for compensation or elimination of undesirable effects of temperature influence
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/0222—Details of interface-acoustic, boundary, pseudo-acoustic or Stonely wave devices
Definitions
- the present invention relates to an elastic wave device using an elastic wave such as a surface acoustic wave or a boundary acoustic wave, and more specifically, a temperature characteristic improving film for adjusting a frequency temperature coefficient is laminated on a piezoelectric substrate.
- the present invention relates to an elastic wave device having a structure.
- Patent Document 1 discloses an example of this type of surface acoustic wave device.
- FIG. 8 is a schematic front sectional view for explaining the surface acoustic wave device described in Patent Document 1.
- an interdigital electrode (IDT electrode) 103 is provided on the piezoelectric substrate 102.
- An insulating protective film 104 having a smaller linear expansion coefficient than that of the piezoelectric substrate 102 is formed so as to cover the IDT electrode 103.
- the frequency adjustment film 105 is formed on the insulating protective film 104.
- the insulating protective film 104 is provided as a temperature characteristic improving film in order to reduce a change in frequency characteristics due to temperature.
- the insulating protective film 104 is made of SiO.
- the frequency adjustment film 105 is made of Si N (Sonic wave speed 6000 mZs) faster than SiO.
- X and y are numbers corresponding to the composition ratio), and by adjusting the thickness of the frequency adjustment film 105, frequency adjustment such as the center frequency and the resonance frequency is achieved.
- Patent Document 1 Japanese Patent Laid-Open No. 2001-44787
- the frequency temperature characteristic is improved by the insulating protective film 104 and the frequency is adjusted by the frequency adjusting film 105 as described above.
- the frequency adjustment film 105 SiO (thermal expansion coefficient 0.55 X 1
- ⁇ on the horizontal axis in FIG. 9 indicates the wavelength of an elastic wave such as a surface acoustic wave or boundary acoustic wave.
- An object of the present invention is an elastic wave device in which a frequency adjusting film is laminated on a temperature characteristic improving film for eliminating the above-mentioned drawbacks of the prior art and improving temperature characteristics, It is an object of the present invention to provide an elastic wave device in which the frequency characteristics can be adjusted by the adjusting film, and the temperature characteristic is hardly deteriorated by the provision of the frequency adjusting film.
- a piezoelectric substrate an IDT electrode formed on the piezoelectric substrate, a temperature characteristic improving film formed on the piezoelectric substrate so as to cover the IDT electrode
- the piezoelectric substrate is made of a piezoelectric material having a negative frequency temperature coefficient TCF
- the temperature characteristic improving film has a frequency
- the frequency adjustment film is made of a material having a positive temperature coefficient TCF, and the frequency adjustment film has a transverse wave velocity that is slower than the transverse wave velocity in the temperature characteristic improving film and is smaller than the linear expansion coefficient of the piezoelectric substrate!
- An elastic wave device is provided, which is characterized by comprising a glass thin film having a coefficient.
- the piezoelectric substrate includes: The first and second temperature characteristic improving films are made of a material having a positive frequency temperature coefficient TCF, and the frequency adjusting films are the first and second frequency material.
- an elastic wave device characterized by comprising a glass thin film having a transverse wave sound velocity slower than that of the temperature characteristic improving film, and having a linear expansion coefficient smaller than that of the piezoelectric substrate.
- the temperature characteristic improving film has a material force with a positive frequency temperature coefficient TCF
- the piezoelectric substrate is made of a piezoelectric material with a negative frequency temperature coefficient TCF.
- the glass thin film is made of an inorganic material formed by mixing at least two kinds of inorganic oxides. At least one of the inorganic oxides is an acid key.
- the sound speed can be adjusted in the slower direction, and the linear expansion coefficient can be adjusted.
- the glass thin film is made of an inorganic material having a linear expansion coefficient smaller than the linear expansion coefficient of the piezoelectric substrate, and thereby, a change in characteristics due to a temperature change is more effective. Can be suppressed.
- the elastic wave device according to the present invention may be an elastic boundary wave device using an elastic boundary wave propagating through the interface between the piezoelectric substrate and the temperature characteristic improving film, or on the piezoelectric substrate.
- a surface acoustic wave device using a propagated surface acoustic wave may be used.
- the temperature characteristic improving film preferably, one material selected from the group force consisting of silicon oxide, titanium oxide and aluminum oxide force is used.
- a temperature characteristic improving film made of a material having a positive frequency temperature coefficient TCF is formed on a piezoelectric substrate having a negative frequency temperature coefficient TCF and a piezoelectric material force.
- the absolute value force S of the frequency temperature coefficient TCF is reduced.
- the frequency adjustment film is made of a glass thin film having a transverse wave sound speed slower than that of the temperature characteristic improvement film and having a low thermal expansion coefficient, the addition of the frequency adjustment film reduces the frequency.
- the frequency temperature coefficient TCF can be shifted in the positive direction.
- the frequency temperature coefficient TCF can be completely reduced by laminating the frequency adjusting film.
- the pair value can be brought close to 0. Accordingly, it is possible to provide an elastic wave device that is thin, hardly changes in the frequency temperature coefficient TCF, and can adjust the frequency to a desired frequency position.
- the first temperature characteristic improving film and the second temperature characteristic improving film are made of a material with a positive frequency temperature coefficient TCF, and the frequency temperature coefficient TCF of the piezoelectric substrate is Negative Therefore, the absolute value of the frequency temperature coefficient TCF can be reduced.
- the frequency adjustment film is made of a glass thin film with a transverse wave sound velocity slower than that of the first and second temperature characteristic improvement films and a small thermal expansion coefficient.
- the frequency temperature coefficient TCF can be shifted in the positive direction. Therefore, when the thickness of the first and second temperature characteristic improving films is reduced in order to reduce the thickness, the absolute value of the frequency temperature coefficient TCF may become a relatively large negative value.
- the absolute value of the frequency temperature coefficient TCF can be effectively brought close to zero. Therefore, it is possible to provide an elastic wave device that is thin enough to adjust the frequency to a desired frequency and has excellent temperature characteristics.
- the first and second temperature characteristic improving films are formed above and below the frequency adjusting film, the temperature characteristics can be further effectively improved.
- FIG. 1 is a schematic front sectional view of a surface acoustic wave device according to a first embodiment of the present invention.
- FIG. 2 shows changes in the frequency temperature coefficient TCF of the surface acoustic wave device when the thickness of the frequency adjustment film and the type of glass constituting the frequency adjustment film are changed in the first embodiment.
- FIG. 3 is a diagram showing a change in sound velocity in the surface acoustic wave device when the thickness of the frequency adjustment film and the material constituting the frequency adjustment film are changed in the first embodiment.
- FIG. 4 is a schematic front sectional view of a boundary acoustic wave device according to a second embodiment of the present invention.
- FIG. 5 shows changes in the frequency temperature coefficient TCF of the boundary acoustic wave device when the thickness of the frequency adjusting film and the type of glass constituting the frequency adjusting film are changed in the second embodiment.
- FIG. 6 is a diagram showing a change in sound velocity in the boundary acoustic wave device when the thickness of the frequency adjustment film and the material constituting the frequency adjustment film are changed in the second embodiment.
- FIG. 7 is a diagram for explaining a process in which frequency adjustment is performed by changing the film thickness of the frequency adjustment film in the boundary acoustic wave device according to the second embodiment. It is a figure which shows the relationship between the thickness of a film
- FIG. 8 is a schematic front sectional view showing an example of a conventional surface acoustic wave device.
- FIG. 9 is a diagram showing the relationship between the thickness of a SiN film used as a frequency adjustment film in a conventional surface acoustic wave device and the frequency temperature coefficient TCF.
- FIG. 1 is a front sectional view showing an acoustic wave device according to a first embodiment of the present invention.
- the elastic wave device 1 according to the present embodiment is an elastic table using a love wave obtained by forming a leaky surface acoustic wave into a rub. It is a surface wave device.
- the acoustic wave device 1 has a piezoelectric substrate 2.
- Piezoelectric substrate 2 has a 38 ° Y-cut X-propagation LiTa O force. This 38 ° Y-cut X-propagation LiTaO frequency temperature coefficient TCF is -42pp
- An IDT electrode 3 is formed on the piezoelectric substrate 2.
- the IDT electrode 3 has Cu force, and its film thickness is not particularly limited, but is about 0.05 ⁇ .
- the IDT electrode 3 may be formed of an appropriate metal or alloy other than Cu, or may be formed of a laminated metal film in which a plurality of metal layers are laminated.
- a temperature characteristic improving film 4 is laminated so as to cover the IDT electrode 3.
- the temperature characteristic improving film 4 is formed of a SiO film having a thickness of 0.25 mm when the surface wave has a wavelength.
- the frequency temperature coefficient TCF of the SiO film is +84.2 ppmZ ° C, and has a positive value. Also
- the shear wave velocity of the two films is 3757 mZ seconds, and the linear expansion coefficient is 0.55 X 10 "V ° C.
- the frequency adjusting film 5 is laminated on the temperature characteristic improving film 4.
- the frequency adjustment film 5 is formed of a glass thin film whose transverse wave sound speed is slower than that of the temperature characteristic improving film 4. Further, the linear expansion coefficient of the frequency adjustment film 5 is made smaller than the linear expansion coefficient of the piezoelectric substrate 2.
- the temperature characteristic improving film 4 is made of SiO and has a positive frequency.
- the piezoelectric substrate 2 is made of LiTaO and has a negative frequency temperature coefficient TCF
- the frequency adjustment film 5 can set the resonance frequency and the center frequency to a desired frequency, and at the same time, the frequency temperature coefficient TCF can be shifted in the positive direction to bring the absolute value of the frequency temperature coefficient TCF closer to zero. it can. [0027] Therefore, when the thickness of the temperature characteristic improving film 4 having SiO force is reduced, the thickness can be reduced.
- the frequency temperature coefficient TCF can be brought close to 0 by adding the frequency adjusting film 5.
- IDT electrode 3 made of Cu on piezoelectric substrate 2 that also has the LiTaO force of 38 ° Y-cut X propagation.
- a structure with 4 layers was prepared. After that, on the temperature characteristic improving film 4, one of the glass A to E and X in Table 1 and Table 2 below is used, and a frequency adjusting film having various thicknesses is formed. A seed acoustic wave device 1 was produced. In Table 2 below, shear wave velocity and linear expansion coefficient of SiO and Si N, LiTaO and LiNbO, which are not only glass, are used.
- FIG. 2 shows the relationship between the film thickness of the number adjusting film 5 and the frequency temperature coefficient TCF of the elastic wave device 1.
- the frequency temperature coefficient TCF slightly decreases when the thickness of the frequency adjustment film increases, whereas other glass A to It can be seen that when the frequency adjustment film made of E is used, the frequency temperature coefficient TCF can be shifted in the positive direction as the thickness of the glass thin film is increased. That is, the shear wave velocity is SiO
- Temperature characteristics improvement film that also has 2 power 4 Sonic wave speed of 3757 mZ seconds, glass A to glass
- FIG. 3 shows a frequency adjustment film or Si N film formed using the above various glasses.
- FIG. 4 is a diagram showing the relationship between the thickness of 3 4 and the sound speed of a Love wave as a surface wave.
- the shear wave velocity is SiO, that is, the temperature characteristics are improved.
- the frequency temperature coefficient TCF of the elastic wave device 1 is shifted in the positive direction, so that the thickness of the temperature characteristic improving film 4 is reduced. Even when it is difficult to bring the value close to 0, the absolute value of the frequency temperature coefficient TCF can be further reduced by forming the glass thin film, and the force is also evident from FIG. It is clear that the frequency can be adjusted to lower the frequency.
- the SiO as the temperature characteristic improving film is thickened.
- the temperature characteristic improvement SiO can be made thinner, and the insertion loss and other characteristics are about ldB.
- FIG. 4 is a front sectional view showing an acoustic wave device according to the second embodiment of the present invention.
- the IDT electrode 13 is formed on the piezoelectric substrate 12, and the first temperature characteristic improving film 14 is formed so as to cover the IDT electrode 13.
- a frequency adjusting film 15 and a second temperature characteristic improving film 16 are laminated in this order on the first temperature characteristic improving film 14.
- the first and second temperature characteristic improving films 14 and 16 are disposed on both surfaces of the frequency adjusting film 15.
- the piezoelectric substrate has a LiNbO substrate with Euler angles of (0 °, 105 °, 0 °).
- the plate strength is also achieved.
- the frequency temperature coefficient TCF of this LiNbO substrate is -84ppmZ ° C,
- the expansion coefficient is 15.4 X 10 _6 Z ° C.
- the IDT electrode 13 has a thickness of 0.04 due to the Au force.
- the IDT electrode 13 may be formed of another metal or alloy, or may be formed of a laminated metal film in which a plurality of metal layers are laminated.
- the first and second temperature characteristic improving films 14, 16 are made of SiO in this embodiment, and the film thickness thereof is
- the frequency adjustment film 15 is made of a glass thin film, and the sound velocity of the shear wave is higher than that of SiO.
- the total of the first and second temperature characteristic improving films 14 and 16 is set to 1.5 ⁇ .
- the piezoelectric substrate 2 and the first temperature characteristic improving film 14 and 16 are formed.
- the boundary acoustic wave propagating at the interface with the temperature characteristic improving film 14 of 1 is excited, and frequency characteristics are obtained by using the boundary wave. That is, the elastic wave device 11 of the present embodiment is a boundary acoustic wave device.
- LiNbO is a force having a negative frequency temperature coefficient TCF.
- the second temperature characteristic improving films 14, 16 are made of SiO having a positive frequency temperature coefficient TCF.
- the absolute value of the frequency temperature coefficient TCF can be close to zero. Especially the SiO force
- the first and second temperature characteristic improvement films 14 and 16 have a slightly smaller total film thickness.Frequency of temperature coefficient TCF even when it is difficult to bring the absolute value of TCF close to 0.
- the frequency temperature coefficient TCF can be shifted in the positive direction by attaching the frequency adjusting film 15 made of a slow glass thin film. As a result, the absolute value of the frequency temperature coefficient TCF can be further reduced / J.
- the frequency adjusting film 15 made of the glass thin film can be adjusted in the direction of decreasing the frequency, as in the case of the first embodiment. This will be described with reference to FIG. 5 and FIG.
- FIG. 5 shows the thickness of the frequency adjustment film 15 and the boundary acoustic wave when the glass constituting the frequency adjustment film 15 is composed of glass A to glass E and glass X in the boundary acoustic wave device.
- 4 is a diagram showing a relationship with a frequency temperature coefficient TCF of the device 1.
- FIG. The film thicknesses of films 14 and 16 are 0.4 ⁇ and 1.1 ⁇ , respectively.
- the frequency temperature coefficient TCF can be shifted in the positive direction as the thickness of the frequency adjusting film 15 made of the glass thin film is increased. Therefore, as in the case of the first embodiment, the first, which also has SiO force.
- the frequency adjustment film 15 is provided.
- the absolute value of the frequency temperature coefficient TCF can be made closer to zero.
- FIG. 6 shows a first and second embodiment of the acoustic wave device having the IDT electrode 13, the first and second temperature characteristic improving films 14 and 16, and the frequency adjustment 15 on the piezoelectric substrate 12.
- the film thickness of SiO and the frequency adjustment film 15 constituting the temperature characteristic improvement films 14 and 16 were changed.
- the L force indicates the thickness of the first temperature characteristic improving film 14
- U indicates the thickness of the second temperature characteristic improving film 16.
- the glass A described in Table 1 was used as the glass thin film.
- the frequency adjusting film 1 that also has glass power 1 It can be seen that even if the thickness of 5 is changed, the sound speed does not change, and therefore the frequency cannot be adjusted sufficiently.
- the total thickness of the first and second temperature characteristic improving films 14 and 16 is 1.5, the ratio may be changed. Even in this case, it can be seen that the speed of sound decreases as the thickness of the frequency adjustment film 15 made of a glass thin film increases. Therefore, it can be seen that the frequency can be adjusted to lower the frequency by adjusting the thickness of the frequency adjusting film 15. The same result is obtained when the total thickness of the first and second temperature characteristic improving films 14 and 16 is not 1.5 ⁇ .
- the second embodiment is also thinner and has excellent frequency temperature characteristics in which the absolute value of the frequency temperature coefficient TCF is close to 0, and is desired. Therefore, it is possible to provide an elastic wave device that can easily adjust the frequency to the resonance frequency and the center frequency.
- the boundary acoustic wave is used, but the first and second temperatures that cause the SiO force are also used.
- the surface acoustic wave device using surface acoustic waves can be obtained.
- the temperature characteristic improving film 4 also having SiO force 4
- each of the temperature characteristic improving films 4, 14, 16 is made of SiO.
- the material that constitutes the temperature characteristic improving film is not limited to oxygen, but titanium oxide, aluminum oxide, etc. may be used.
- the temperature characteristic improving film can be formed of various materials as long as it has a positive frequency temperature coefficient TCF.
- the frequency adjusting films 5 and 15 are not particularly limited in the constituent glass materials as long as the sound speed of the shear wave is slower than that of the temperature characteristic improving film and the coefficient of thermal expansion.
- the linear expansion coefficient is made smaller than the linear expansion coefficient of the piezoelectric substrates 2 and 12 as described above. . in addition Therefore, since the expansion / contraction force S of the frequency adjusting films 5 and 15 due to the temperature change is reduced, the fluctuation of the frequency characteristic due to the temperature change can be further reduced as shown in FIGS.
- FIG. 7 is a frequency diagram for explaining the meaning of frequency adjustment when the frequency adjustment film 15 is formed thick in the boundary acoustic wave device of the second embodiment and a frequency lower than the desired frequency is obtained. It is a figure which shows the relationship between the thickness of an adjustment film
- a point P 1 represents a 0.2 SiO film formed as the IDT electrode 13 and the first temperature characteristic improving film 14 on the piezoelectric substrate 12, and the horizontal axis in FIG. 0. 0 shown
- the value of the point represented by the sound velocity SP3 when the second temperature characteristic improving film 15 having a thickness of 1.3 ⁇ is laminated on the uppermost portion, that is, the sound velocity is about 3340 mZ seconds.
- the point of P4 is that a 0.2 ⁇ first temperature characteristic improving film 14 is laminated on the piezoelectric substrate 2 to obtain a glass having a thickness of 0.048 mm. Without adjusting the frequency adjustment film, a temperature characteristic improvement film 15 consisting of a SiO film with a thickness of 1.3 is formed.
- the sound speed difference indicated by arrow A in FIG. 7 corresponds to the frequency adjustment amount.
- the sound speed by reducing the thickness of the frequency adjustment film 15 made of a glass thin film to 0.048 ⁇ force 0.04, the sound speed finally changes by the amount indicated by the arrow ⁇ . This corresponds to the amount of frequency adjustment caused by changing the film thickness.
- the thickness of the lower first temperature characteristic improving film 14 is 0.4
- the upper temperature characteristic improving film 16 is 1.1 ⁇ .
- the speed of sound in the same manner as in the case of points P1 to ⁇ 3 is shown, and the point Q4 shows the position of the speed of sound in a considerable structure in which the thickness of the frequency adjustment film 15 is not reduced. Accordingly, the difference in sound speed indicated by the arrow ⁇ in FIG. 7 corresponds to the frequency adjustment amount when the thickness of the frequency adjustment film 15 is similarly changed.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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DE112007001259.5T DE112007001259B4 (de) | 2006-05-30 | 2007-05-14 | Schallwellenvorrichtung |
JP2008517821A JP4692629B2 (ja) | 2006-05-30 | 2007-05-14 | 弾性波装置 |
US12/272,841 US7863801B2 (en) | 2006-05-30 | 2008-11-18 | Acoustic wave device |
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JP2006149853 | 2006-05-30 | ||
JP2006-149853 | 2006-05-30 |
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US12/272,841 Continuation US7863801B2 (en) | 2006-05-30 | 2008-11-18 | Acoustic wave device |
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WO2007138844A1 true WO2007138844A1 (ja) | 2007-12-06 |
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US (1) | US7863801B2 (ja) |
JP (1) | JP4692629B2 (ja) |
DE (1) | DE112007001259B4 (ja) |
WO (1) | WO2007138844A1 (ja) |
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Also Published As
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JPWO2007138844A1 (ja) | 2009-10-01 |
DE112007001259B4 (de) | 2015-07-23 |
US20090058225A1 (en) | 2009-03-05 |
JP4692629B2 (ja) | 2011-06-01 |
DE112007001259T5 (de) | 2009-06-25 |
US7863801B2 (en) | 2011-01-04 |
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