WO2002066930A1 - Angular velocity sensor and method of adjusting characteristics of the sensor - Google Patents
Angular velocity sensor and method of adjusting characteristics of the sensor Download PDFInfo
- Publication number
- WO2002066930A1 WO2002066930A1 PCT/JP2002/001377 JP0201377W WO02066930A1 WO 2002066930 A1 WO2002066930 A1 WO 2002066930A1 JP 0201377 W JP0201377 W JP 0201377W WO 02066930 A1 WO02066930 A1 WO 02066930A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vibrating body
- vibrator
- angular velocity
- electrode
- velocity sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/56—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces
- G01C19/5607—Turn-sensitive devices using vibrating masses, e.g. vibratory angular rate sensors based on Coriolis forces using vibrating tuning forks
Definitions
- the present invention relates to an angular velocity sensor used in attitude control of a moving body such as an aircraft or a vehicle and a navigation system, and a method of adjusting the characteristic thereof.
- FIG. 13 is a perspective view of a conventional angular velocity sensor.
- a first detection electrode 2 is provided on an outer surface of a first vibrating body 1 made of quartz, and a first drive electrode 3 is provided on the surface.
- a second detecting electrode (not shown) is provided on the outer surface of the second vibrating body 4, and the second driving electrode 3 on the first vibrating body 1 is continuously connected to the first driving electrode 3 on the first vibrating body 1.
- Electrode 5 is provided.
- the connection part 6 connects one end of the first vibrating body 1 and one end of the second vibrating body 4 integrally.
- the angular velocity becomes Even if not applied to the speed sensor, the imbalance causes the first vibrating body 1 and the second vibrating body 4 to be displaced in the X-axis direction.
- the first detecting electrode 2 and the second detecting electrode FIG. (Not shown).
- the ridge line of the second vibrating body 4 and the connecting part 6 is cut by the re-use unit 11 and provided on the ridge line of the second vibrating body 4 and the connecting part 6.
- the weight balance of the first vibrating body 1 and the second vibrating body 4 is balanced by the amount of the ground portion 12 that has been ground.
- the grinding portion is formed by minute eccentricity of the luster 11.
- the surface roughness of 12 is as rough as approximately 5 as measured, and as shown in Table 1, the output voltage without an angular velocity is ⁇ 1 OmV, degrading the output characteristics of the angular velocity sensor.
- the angular velocity sensor includes a first vibrator having at least one of a drive electrode and a detection electrode, a second vibrator having at least one of a drive electrode and a detection electrode, and one end of the first vibrator.
- a ground portion having a surface roughness of 2 or less is formed on at least one of the ridge line of the first vibrator, the second vibrator, and the ridge line.
- FIG. 1 is an exploded perspective view of an angular velocity sensor according to an embodiment of the present invention.
- FIG. 2 is a side sectional view of the angular velocity sensor according to the embodiment.
- FIG. 3 is a perspective view of a tuning fork which is a main part of the angular velocity sensor according to the embodiment.
- FIG. 4 is a perspective view of a tuning fork of the angular velocity sensor according to the embodiment.
- FIG. 5 is a block diagram of a circuit board of the angular velocity sensor according to the embodiment.
- FIG. 6 is a schematic diagram showing an operation state of the angular velocity sensor according to the embodiment.
- FIG. 7 is a schematic diagram showing an operation state of the angular velocity sensor according to the embodiment.
- FIG. 8 is a waveform diagram showing an operation state of the angular velocity sensor according to the embodiment.
- FIG. 9 is a side view showing a method of adjusting the characteristics of the angular velocity sensor according to the embodiment.
- FIG. 10 is a perspective view showing a state where the sound of the angular velocity sensor according to the embodiment is ground with a tape.
- FIG. 11 is a waveform chart showing a state of adjusting the characteristics of the angular velocity sensor according to the embodiment.
- FIG. 12 shows an output signal of a band-pass filter in one monitor circuit of the angular velocity sensor and an output signal of a phase shifter in the detecting means in the embodiment.
- FIG. 13 is a perspective view of a conventional angular velocity sensor.
- FIG. 14 is a perspective view showing a state where a vibrating body, which is a main part of a conventional angular velocity sensor, is ground with a screw.
- FIG. 1 is an exploded perspective view of an angular velocity sensor according to an embodiment of the present invention
- FIG. 2 is a sectional side view thereof
- FIG. 3 is a perspective view of a tuning fork, which is a main part of the sensor, as viewed from the front side
- FIG. 5 is a block diagram of a circuit board of the sensor.
- a first driving electrode 22 is provided on the surface of the first vibrating body 21, which is made by bonding thin plates made of single crystal quartz having different crystal axes to each other, as shown in FIG.
- a second drive electrode 23 is provided.
- a first detection electrode 24 made of gold is provided on the outer surface of the first vibrating body 21, and a second detection electrode 25 made of gold is provided on the inner surface.
- a monitor electrode 27 made of gold is provided on the surface of the second vibrating body 26 in which single crystal quartz plates having different crystal axes are bonded to each other, and a third drive electrode 28 is provided on the back surface.
- a third detection electrode 29 is provided on the outer surface of the second vibrating body 26, and a fourth detection electrode 30 is provided on the inner surface. From crystal
- the connecting part 31 connects one end of each of the first vibrating body 21 and the second vibrating body 26.
- the first vibrating body 21, the second vibrating body 26, and the connection part 31 constitute a sound or 31 a.
- a grinding portion 3 1b having a surface roughness of 2 m or less is provided on the ridge on the front side of the first vibrating body 21 in the tuning fork 31a, and the first vibrating body 21 and the second The balance of the weight of the vibrator 2 6 is adjusted.
- the first base 32 made of metal fixes the connection part 31, and is provided with six terminal insertion holes 33.
- the first drive electrode 22, the second drive electrode 23, the third drive electrode 28, the monitor —electrode 27, the first detection electrode 24, and the second drive electrode 22 Six terminals 34 electrically connected to the detection electrode 25, the third detection electrode 29, and the fourth detection electrode 30 are inserted respectively. As shown in FIG.
- a relief portion 3 2 a is provided on the base 32 on the side opposite to the grinding portion 3 1 b of the first vibrator 21 and the second vibrator 26.
- the metal cover 35 is fixed to the outer periphery of the first base 32, and the first base 32 and the cover 35 are connected to the first vibrator 21 and the second vibrator 26.
- the tuning fork 3 1 a composed of the connection part 31 are housed.
- the metal support plate 36 has a support portion 37 for supporting the first base 32 on a side surface thereof. By crimping the support portion 37 to the first base 32, the first base 32 is fixed to the support plate 36.
- a total of three support projections 38 are provided at both ends in the longitudinal direction of the support plate 36.
- the circuit board 39 is provided substantially parallel to the support plate 36, and is fixed to the support plate 36 by soldering with the support protrusion 38 of the support plate 36.
- the electronic component 40 mounted on the surface of the circuit board 39 controls the voltage applied to the first drive electrode 22, the second drive electrode 23, the third drive electrode 28, and the monitor electrode 27. Then, output signals generated from the first detection electrode 24, the second detection electrode 25, the third detection electrode 29, and the fourth detection electrode 30 are processed.
- the electronic component 40 forms a circuit as shown in FIG.
- the monitor circuit 4 4 includes a current amplifier 45 to which the charge of the monitor electrode 27 of the tuning fork 31 a is input, a band-pass filter (BPF) 46 to which the output signal of the current amplifier 45 is input, A rectifier 47 to which an output signal of the BPF 46 is input, and a smoothing circuit 48 to which an output signal of the rectifier 47 is input.
- the AGC circuit 49 receives the output signal of the smoothing circuit 48 and amplifies or attenuates the output signal of the BPF 46.
- the drive control circuit 50 receives an output signal of the AGC circuit 49 and inputs a drive signal to the first drive electrode 22, the second drive electrode 23, and the fourth drive electrode 30 of the tuning fork 3 la. .
- the first current amplifier 5 1 is the first The electric charge generated by the Corioliser at the second detection electrode 25 of the first vibrating body 21 and the fourth detection electrode 30 of the second vibrating body 26 is converted into a voltage.
- the second current amplifier 52 converts the electric charge generated by the Corioliser to the first detection electrode 24 in the first vibrator 21 and the third detection electrode 29 in the second vibrator 26 into a voltage.
- the differential amplifier 53 adds a signal obtained by inverting the output signal of the second current amplifier 52 to the output signal of the first current amplifier 51, and outputs the result.
- the BPF 54 receives the output signal of the differential amplifier 53 and outputs only a signal in a predetermined frequency band.
- the phase shifter 55 delays the phase of the output signal of the BPF 54 by about 90 degrees.
- the synchronous detector 56 outputs the component of the output signal of the phase shifter 55 having only the same phase as that of the output of the BPF 46 of the monitor circuit 44, and inverts the negative charge component to a positive voltage to output. I do.
- the smoothing circuit 56 a smoothes the output signal of the synchronous detector 56.
- the DC amplifier 56b amplifies the output signal of the smoothing circuit 56a.
- a substantially U-shaped rubber body 57 supporting both side surfaces of the support plate 36 has a portion 59 having a small cross-sectional area, and the portion 59 having a small cross-sectional area reduces the compressive force of the rubber body 57. Reduce.
- the first drive electrode 22 on the front of the first vibrator 21, the second drive electrode 23 on the back, the first detection electrode 24 on the outer side, and the second detection electrode 24 on the inner side 25 are formed by vapor deposition of gold, respectively, the monitor electrode 27 on the front of the second vibrator 26, the third drive electrode 28 on the back, the fourth detection electrode 30 on the inner side, and the outer electrode on the outer side.
- the third detection electrodes 29 are each formed by vapor deposition of gold.
- the terminal holes 33 are filled with an insulating material (not shown) made of glass.
- the first The six terminals 3 4 are fixedly attached to the base 3 2.
- the terminal 34 is connected to the first drive electrode 22, the second drive electrode 23, and the first detection electrode 24.
- the second detection electrode 25, the monitor one electrode 27, the third drive electrode 28, the third detection electrode 29, and the fourth detection electrode 30 are each made of a lead wire (shown in the drawing) made of gold. ) Is connected by wire-bonding.
- the cover 35 is fixed to the outer peripheral portion of the first base 32 in a vacuum atmosphere so that the inside of the cover 35 is evacuated.
- the support plate 36 is fixed to the first base 32 by caulking the support portion 37.
- the support projection 38 is soldered, and the circuit board 39 is fixed to the support plate 36.
- the terminals 34 on the first base 32 are electrically connected to electrodes (not shown) of the circuit board 39 by soldering.
- circuit board 39 and the support plate 36 are sandwiched by a substantially U-shaped rubber body 57 on which a portion 59 having a small cross-sectional area is formed.
- the circuit board 39 is electrically connected to the power terminal 63, the GND terminal 64, and the output terminal 65 by the flexible wiring board 39a, respectively.
- An AC voltage is applied to the first drive electrode 22, the second drive electrode 23, and the third drive electrode 28 of the tuning fork 31 a.
- a positive voltage is applied to the second drive electrode 23 of the first vibrating body 21 and a negative voltage is applied to the first drive electrode 22.
- the first detection electrode 24 side extends because the direction of the crystal axis and the direction of the charge in the thin quartz plate are the same, and the second detection electrode 25 side extends in the direction of the crystal axis and the direction of the charge. Shrinks because it is the opposite. As a result, the first vibrator 21 tilts in the direction of the second vibrator 26.
- a negative voltage is applied to the second drive electrode 23 of the first vibrating body 21, and a positive voltage is applied to the first drive electrode 22.
- the side of the first detection electrode 24 shrinks because the direction of the crystal axis and the direction of the electric charge in the thin quartz plate are opposite, and the side of the second detection electrode 25 ends with the direction of the crystal axis and the direction of the electric charge. Are the same so they grow. As a result, the first vibrating body 21 tilts outward.
- the output signal of the BPF 46 is input to the rectifier 47 and its negative voltage component is converted to a positive voltage, and then input to the smoothing circuit 48 and converted to a DC voltage signal.
- the AGC circuit 49 attenuates the output signal of the BPF 46 when the DC voltage output from the smoothing circuit 48 is high, and drives the signal that amplifies the output signal of the BPF 46 when the DC voltage is low. Input to 50, and adjust the vibration of tuning fork 31a to a constant.
- the Corioliser generates the voltage (b) shown in FIG. 8 at the first detection electrode 24 and the third detection electrode 29, and the voltage is applied to the second detection electrode 25 and the fourth detection electrode 30.
- the output of the phase shifter 55 is phase-detected by the synchronous detector 56 at the cycle of the output signal of the BPF 46, and the negative charge component of the detected output voltage is converted into a positive voltage to output the voltage (f). Is done.
- the output voltage of the synchronous detector 56 is smoothed by the smoothing circuit 56a and amplified by the DC amplifier 56b to obtain a voltage (g).
- the output signal of the DC amplifier 56b is input as an angular velocity signal to a computer (not shown) or the like, and the angular velocity is detected.
- FIG. 9 is a side view showing a method for adjusting the characteristics of the angular velocity sensor according to the embodiment of the present invention.
- FIG. 10 is a perspective view showing a state in which the sound of the angular velocity sensor is ground with tape.
- FIG. 11 is a graph showing the characteristics of the angular velocity sensor. It is a waveform diagram which shows the state which adjusts.
- Fig. 12 shows the BPF of the monitor circuit of the angular velocity sensor and the output signal of the phase shifter in the detection means. In the state where the angular velocity is not applied to the angular velocity sensor, the weight of the first vibrating body 21 and the second vibrating body 26 is not balanced, and even if the output signal from the monitor electrode 27 is zero.
- the first vibrating body 21 and the second vibrating body 26 are displaced perpendicular to the driving direction. Therefore, the detection signal (a) shown in FIG. 11 is output from the second detection electrode 25 and the fourth detection electrode 30 as if Coriolisa were acting due to the angular velocity, and the first detection electrode 2
- the detection signal (b) is output from the fourth and third detection electrodes 29.
- the output signal of the phase shifter 55 of the monitor circuit 44 is compared by a comparator (not shown) provided in the trimming device.
- the tape 68 can be disposed in the relief portion 32a, the base 32 does not hinder the tape 68 abutting on the ridge line of the vibrating body 21.
- the tape 68 can be brought into contact with the ridge line of the first vibrating body 21.
- the tension roller 69 is loaded on the tape 68, and the tape 68 comes into contact with the surface of the first vibrating body 21 with a constant force due to the weight of the tension roller 69. .
- the tape 68 abuts at an angle of about 7 degrees with respect to the longitudinal direction of the first vibrating body 21, so that the connecting portion 3 of the first vibrating body 21 is formed. Apply a large external force to the 1 side.
- the tape 68 When an excessive external force is applied to the tape 68, the tape 68 absorbs the external force applied to the first vibrating body 21 or the second vibrating body 26 due to its flexibility. A uniform and stable load can be applied to the vibrators 21 and 26 of the present invention. As a result, the first vibrating body 21 is not damaged when a load is applied.
- the tension roller 69 applies a load to the tape 68 so that the tape 68 is pressed against the ridge line of the first vibrator 2 1 with a certain force and slides. Do not give excessive external force to 1. As a result, the first vibrator 21 is not damaged during the adjustment of the characteristics.
- the angular velocity sensor according to the present invention can precisely adjust the weight balance between the two vibrators, so that no external force other than the driving direction is applied to the vibrator when no angular velocity is applied.As a result, the sensor accurately detects the angular velocity it can.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Gyroscopes (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/257,127 US6874348B2 (en) | 2001-02-19 | 2002-02-18 | Angular velocity sensor and method of adjusting characteristics of the sensor |
| EP02712427A EP1296114A4 (en) | 2001-02-19 | 2002-02-18 | ROTATING SPEED SENSOR AND METHOD FOR ADJUSTING PROPERTIES OF THE SENSOR |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001-041336 | 2001-02-19 | ||
| JP2001041336A JP2002243451A (ja) | 2001-02-19 | 2001-02-19 | 角速度センサおよびその特性調整方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002066930A1 true WO2002066930A1 (en) | 2002-08-29 |
Family
ID=18903794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2002/001377 Ceased WO2002066930A1 (en) | 2001-02-19 | 2002-02-18 | Angular velocity sensor and method of adjusting characteristics of the sensor |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6874348B2 (ja) |
| EP (1) | EP1296114A4 (ja) |
| JP (1) | JP2002243451A (ja) |
| WO (1) | WO2002066930A1 (ja) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005055255A (ja) * | 2003-08-01 | 2005-03-03 | Sony Corp | ジャイロ出力検出方法及びジャイロ出力検出装置 |
| WO2005096493A1 (ja) * | 2004-03-30 | 2005-10-13 | Citizen Watch Co., Ltd. | 水晶振動子の製造方法及び水晶振動子 |
| EP1624286B1 (en) | 2004-08-03 | 2017-10-04 | STMicroelectronics Srl | Micro-electro-mechanical sensor with force feedback loop |
| EP1624285B1 (en) | 2004-08-03 | 2014-07-23 | STMicroelectronics Srl | Resonant micro-electro-mechanical system and gyroscope |
| JP4980063B2 (ja) * | 2004-10-07 | 2012-07-18 | パナソニック株式会社 | 角速度センサ |
| WO2007043504A1 (ja) | 2005-10-11 | 2007-04-19 | Matsushita Electric Industrial Co., Ltd. | 振動型慣性力検知センサおよびそれを用いた電子機器 |
| JP4935069B2 (ja) | 2005-12-28 | 2012-05-23 | パナソニック株式会社 | 角速度センサ |
| JP5008424B2 (ja) | 2006-03-14 | 2012-08-22 | シチズンホールディングス株式会社 | 振動子の製造方法 |
| JP2007286027A (ja) * | 2006-03-23 | 2007-11-01 | Citizen Holdings Co Ltd | 圧電振動子の製造方法及びこの圧電振動子を用いた振動ジャイロ |
| JP4696996B2 (ja) | 2006-03-27 | 2011-06-08 | パナソニック株式会社 | 慣性力センサ |
| JP5274803B2 (ja) * | 2006-09-27 | 2013-08-28 | シチズンホールディングス株式会社 | 発振装置、および振動ジャイロ |
| JP2010060358A (ja) * | 2008-09-02 | 2010-03-18 | Murata Mfg Co Ltd | 角速度センサ |
| JP5528337B2 (ja) | 2008-10-16 | 2014-06-25 | シチズンホールディングス株式会社 | 水晶振動子の製造方法 |
| JP5765087B2 (ja) | 2011-06-27 | 2015-08-19 | セイコーエプソン株式会社 | 屈曲振動片、その製造方法及び電子機器 |
| JP2016086383A (ja) | 2014-10-29 | 2016-05-19 | セイコーエプソン株式会社 | 振動素子、電子デバイス、電子機器および移動体 |
| JP2016085192A (ja) | 2014-10-29 | 2016-05-19 | セイコーエプソン株式会社 | 振動素子、電子デバイス、電子機器および移動体 |
| JP6477101B2 (ja) | 2015-03-23 | 2019-03-06 | セイコーエプソン株式会社 | 角速度検出素子、角速度検出デバイス、電子機器および移動体 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5471488A (en) * | 1977-11-17 | 1979-06-08 | Inoue Japax Res Inc | Wire chipping device |
| JPH08201065A (ja) * | 1995-01-31 | 1996-08-09 | Kyocera Corp | 角速度センサ |
| JPH09201758A (ja) * | 1996-01-24 | 1997-08-05 | Furukawa Electric Co Ltd:The | 多心光コネクタの研磨方法およびその研磨機 |
| JPH10197254A (ja) * | 1997-01-07 | 1998-07-31 | Alps Electric Co Ltd | 振動子の支持装置 |
| JPH11351874A (ja) * | 1997-05-07 | 1999-12-24 | Denso Corp | 角速度センサ及びその調整方法 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3823513A (en) * | 1973-10-12 | 1974-07-16 | Dynabrade | Miniature belt grinder |
| DE69318963T2 (de) * | 1993-02-03 | 1998-10-01 | Matsushita Electric Ind Co Ltd | Drehratensensor und dessen Herstellungverfahren |
| JP3029001B2 (ja) * | 1993-10-28 | 2000-04-04 | トヨタ自動車株式会社 | 振動子 |
| DE19812952A1 (de) * | 1997-03-24 | 1999-01-07 | Denso Corp | Winkelgeschwindigkeitsfühler, Verfahren zu seiner Herstellung und piezoelektrisches Schwingerelement zur Verwendung in diesem Fühler |
-
2001
- 2001-02-19 JP JP2001041336A patent/JP2002243451A/ja active Pending
-
2002
- 2002-02-18 EP EP02712427A patent/EP1296114A4/en not_active Withdrawn
- 2002-02-18 US US10/257,127 patent/US6874348B2/en not_active Expired - Fee Related
- 2002-02-18 WO PCT/JP2002/001377 patent/WO2002066930A1/ja not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5471488A (en) * | 1977-11-17 | 1979-06-08 | Inoue Japax Res Inc | Wire chipping device |
| JPH08201065A (ja) * | 1995-01-31 | 1996-08-09 | Kyocera Corp | 角速度センサ |
| JPH09201758A (ja) * | 1996-01-24 | 1997-08-05 | Furukawa Electric Co Ltd:The | 多心光コネクタの研磨方法およびその研磨機 |
| JPH10197254A (ja) * | 1997-01-07 | 1998-07-31 | Alps Electric Co Ltd | 振動子の支持装置 |
| JPH11351874A (ja) * | 1997-05-07 | 1999-12-24 | Denso Corp | 角速度センサ及びその調整方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1296114A4 (en) | 2010-01-06 |
| JP2002243451A (ja) | 2002-08-28 |
| US20040099043A1 (en) | 2004-05-27 |
| EP1296114A1 (en) | 2003-03-26 |
| US6874348B2 (en) | 2005-04-05 |
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