CN202059372U - Device capable of realizing closed-loop temperature compensation of clock crystal oscillator based on high-frequency crystals - Google Patents
Device capable of realizing closed-loop temperature compensation of clock crystal oscillator based on high-frequency crystals Download PDFInfo
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- CN202059372U CN202059372U CN2011201526073U CN201120152607U CN202059372U CN 202059372 U CN202059372 U CN 202059372U CN 2011201526073 U CN2011201526073 U CN 2011201526073U CN 201120152607 U CN201120152607 U CN 201120152607U CN 202059372 U CN202059372 U CN 202059372U
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Abstract
The utility model provides a device capable of realizing closed-loop temperature compensation of a clock crystal oscillator, which constantly calibrates second pulses of 32768 Hz quartz crystals by customizing high-precision high-frequency crystals until high-frequency pulse signal number read in a time gate produced by the 32768 Hz quartz crystals and theoretically accurate high-frequency pulse number are the same. Due to the fact that the 32768 Hz quartz crystals can be calibrated under an optional temperature, the device is capable of compensating frequency deviation produced by the 32768 Hz quartz crystals because of different temperatures within a quite wide temperature range. Due to a closed-loop temperature compensation mode, the process of closed-loop temperature compensation is unrelated to frequency-temperature characteristic curve shape of clock crystals, and accordingly consistency of the clock crystals is not required. Since the device is formed by integrating various devices on a small-scale digital chip added with two crystals, cost is lower and size is also smaller correspondingly.
Description
Technical field
The utility model relates to the technique for temperature compensation field, particularly a kind of device of realizing the compensation of clock crystal oscillator closed loop thermal based on high-frequency crystal.
Background technology
At present, except requiring extra high standard source, the high precision clock frequency of using in industry and the daily life is mainly from quartz oscillator.At present, both at home and abroad the frequency of the quartz oscillator that uses of clock is 32768Hz.
Referring to Fig. 1, this figure is the frequency-temperature characteristic curve chart of 32768Hz quartz oscillator.The frequency departure of 32768Hz quartz oscillator in-30 to+60 ℃ of scopes is about (+40) ppm to (150) ppm (ppm represent 1,000,000/) than Δ F/F, and the clocking error that produces every day can reach more than 15 seconds like this.
Therefore, if reach higher clock accuracy, need carry out temperature-compensating to the frequency departure of quartz oscillator, present temperature-compensating comprises two kinds of hard benefit and soft benefits.
Hard benefit mainly is that the hard cost of mending is higher, and whole volume is bigger, is not suitable for the little and low occasion of cost of clock volume from the enterprising trip temperature compensation of hardware.
The method of soft benefit mainly is to have the MCU chip to come across the occasion of identical product simultaneously, the frequency-temperature characteristic curve conformity that utilizes quartz oscillator preferably the 32768Hz quartz crystal as the independent real-time clock (RTC that hangs in the MCU chip, Real-Time Clock) the outer crystal of circuit, utilize MCU inside/outside portion sensor for measuring temperature detected temperatures value, draw the frequency temperature deviate of this temperature value correspondence by searching the frequency-temperature characteristic curve table, MCU realizes compensation correction by revising pulse per second (PPS) frequency division value (32768 ± N, N are real-time correction value).
This soft compensating method cost is lower at present, but because it is an open-loop compensation, any one goes wrong the consistency of the consistency of the reference voltage that the consistency of frequency-temperature characteristic curve conformity, temperature sensor, A/D gather, the manufacturing of the inner A/D Acquisition Circuit of MCU etc., all can't guarantee final compensation result.If any one or multinomial going wrong are arranged, then will cause compensation result inaccurate.
The utility model content
The technical problems to be solved in the utility model provides a kind of device based on the compensation of high-frequency crystal realization clock crystal oscillator closed loop thermal, and cost is low, and volume is little, and compensation result is accurate.
The utility model provides a kind of and realizes the device that clock crystal oscillator closed loop thermal compensates based on high-frequency crystal, comprising: customization high-frequency crystal, high-frequency counter, demarcation umber of pulse decoder, pulse value subtracter, pulse per second (PPS) correction factor generator, real-time clock RTC circuit, temperature sensor, AD converter, 32768Hz quartz crystal;
The temperature sensor measurement ambient temperature sends to AD converter with the temperature of measuring, and AD converter is converted to digital signal with the ambient temperature of temperature sensor measurement and sends to and demarcate the umber of pulse decoder;
The frequency-temperature characteristic curve of described customization high-frequency crystal is a sectional broken line, is straight line in every section broken line; Temperature T in every section broken line in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a, b are constant;
Real-time clock RTC circuit produces the pulse per second (PPS) that is produced by the vibration of 32768Hz quartz crystal;
When temperature T, high-frequency counter reads the high-frequency impulse number Pt1 that the described customization high-frequency crystal in the scheduled time gate that real-time clock RTC circuit produces produces;
When temperature T, demarcate the umber of pulse decoder and calculate the theoretical high-frequency impulse number Pt2 of described customization high-frequency crystal in described scheduled time gate by Pt=(a*T+b); Described demarcation umber of pulse decoder is stored a, b corresponding in every section broken line in advance; One group of a of every section broken line correspondence, b value;
The pulse value subtracter is Pt1 and Pt2 relatively;
When Pt1 greater than Pt2, pulse per second (PPS) correction factor generator is regulated the narrowed width of the pulse per second (PPS) that the RTC circuit produces; Otherwise the width of regulating the pulse per second (PPS) of RTC circuit generation broadens; Equate with theoretical high-frequency impulse number Pt2 up to the high-frequency impulse number Pt1 that reads.
Preferably, this device also comprises 64 frequency multiplier circuits;
Described 64 frequency multiplier circuits carry out 64 frequencys multiplication with the clock frequency that the 32768Hz quartz crystal produces, and the signal after the frequency multiplication is sent to the RTC circuit, the width of the pulse per second (PPS) that correction factor N that the RTC circuit sends according to pulse per second (PPS) correction factor generator and P adjust output; The RTC circuit produces pulse per second (PPS) and is specially: the clock signal that the 32768Hz quartz crystal produces is carried out 32768 ± Fractional-N frequency and delay or shifted to an earlier date P the signal after the described frequency multiplication.
Preferably, this device also comprises variations in temperature step decoder;
Described variations in temperature step decoder, section regularly receives the digital signal of the temperature that AD converter sends to schedule; Judge whether variation of temperature surpasses preset range, when surpassing preset range, open high-frequency counter, pulse value subtracter, demarcate umber of pulse decoder and pulse per second (PPS) correction factor generator; When not surpassing preset range, close high-frequency counter, pulse value subtracter, demarcate umber of pulse decoder and pulse per second (PPS) correction factor generator.
Preferably, described variations in temperature step decoder is searched corresponding preset range by temperature step table, and described temperature step table is stored in the described variations in temperature step decoder in advance;
Described variations in temperature step decoder judges whether variation of temperature surpasses the preset range of Current Temperatures correspondence; When surpassing preset range, open high-frequency counter, pulse value subtracter, demarcate umber of pulse decoder, pulse per second (PPS) correction factor generator RTC circuit; When not surpassing preset range, close high-frequency counter, pulse value subtracter, demarcate umber of pulse decoder, pulse per second (PPS) correction factor generator and RTC circuit.
Preferably, described temperature step table for-10 ℃ of following temperature step values be 0.2 ℃ ,-10～+ 10 ℃ temperature step values be 0.3 ℃ ,+10～+ 30 ℃ of temperature step values be 0.4 ℃ ,+30～+ 50 ℃ of temperature step values be 0.3 ℃ ,+temperature step value is 0.2 ℃ more than 50 ℃.
Preferably, the frequency of described customization high-frequency crystal is 16MHz.
Compared with prior art, the utlity model has following advantage:
The device of the clock crystal oscillator closed loop thermal compensation that the utility model provides, by customizing the pulse per second (PPS) that high high frequency quartz crystal is accurately constantly proofreaied and correct the 32768Hz quartz crystal, the number of the high-frequency pulse signal that reads in the time gate that produces at the 32768Hz quartz crystal is with the high-frequency impulse number is identical accurately in theory.Owing to can under arbitrary temp, calibrate, so this device can compensate the 32768Hz quartz crystal owing to the different frequency departures that produce of temperature in the wide temperature range very much to the 32768Hz quartz crystal; Because this device has adopted the closed loop thermal compensation way, the frequency-temperature characteristic curve shape of its process and clock crystal is irrelevant, does not therefore require the consistency of clock crystal; Because this device can be integrated in each device a digit chip on a small scale, add two crystal (32768Hz quartz crystal and customization high-frequency crystal) and just can realize, so cost is lower, corresponding volume is also less.
Description of drawings
Fig. 1 is the frequency-temperature characteristic curve chart for the 32768Hz quartz oscillator;
Fig. 2 is device embodiment one structure chart that the utility model provides;
Fig. 3 is device embodiment two structure charts that the utility model provides.
Embodiment
For those skilled in the art being understood better and implementing the technical solution of the utility model, introduce several technical terms relevant below with the utility model.
Quartz oscillator: be a kind of resonating device that utilizes the piezoelectric effect of quartz crystal (crystalline solid of silicon dioxide) to make, its basic comprising roughly is: downcut thin slice from a quartz crystal by certain azimuth and (abbreviate wafer as, it can be square, rectangle or circle etc.), the coating silver layer is as electrode on its two corresponding surfaces, respectively welding a lead-in wire on each electrode receives on the pin, add package casing and just constituted quartz-crystal resonator, abbreviate quartz crystal or crystal oscillator as.
32768Hz quartz crystal Chang Zuowei clock crystal.
High-frequency crystal is generally made a general reference the crystal that frequency is higher than 1MHz, and the high-frequency crystal of the customization of the utility model indication is meant that special manufacturing, frequency-temperature characteristic curve are the multistage broken line, frequency range of the appointment quartz crystal at 1MHz～76MHz.
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
Referring to Fig. 2, this figure is device embodiment one structure chart that the utility model provides.
What present embodiment provided realizes the device that clock crystal oscillator closed loop thermal compensates based on high-frequency crystal, comprising: customization high-frequency crystal 101, high-frequency counter 102, demarcation umber of pulse decoder 103, pulse value subtracter 104, pulse per second (PPS) correction factor generator 105, real-time clock RTC circuit 106, temperature sensor 107, AD converter 108,32768Hz quartz crystal 109;
The ambient temperature that AD converter 108 is measured temperature sensor 107 is converted to digital signal and sends to demarcation umber of pulse decoder 103;
The frequency-temperature characteristic curve of described customization high-frequency crystal 101 is a sectional broken line, is straight line in every section broken line; Temperature T in every section broken line in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a, b are constant;
Real-time clock RTC circuit 106 produces the pulse per second (PPS) that is produced by 109 vibrations of 32768Hz quartz crystal;
When temperature T, high-frequency counter 102 reads the high-frequency impulse number Pt1 that the described customization high-frequency crystal 101 in the scheduled time gate that real-time clock RTC circuit produces produces;
When temperature T, demarcate umber of pulse decoder 103 and calculate the theoretical high-frequency impulse number Pt2 of described customization high-frequency crystal 101 in described scheduled time gate by Pt=(a*T+b); Described demarcation umber of pulse decoder 103 is stored a, b corresponding in every section broken line in advance; One group of a of every section broken line correspondence, b value;
A, obtaining specifically of b value can be obtained by the following method in every section broken line:
Therefore because the frequency-temperature characteristic curve of customization high-frequency crystal is a sectional broken line, every section broken line is a straight line, can obtain temperature T in this customization high-frequency crystal unit interval and the expression formula of high-frequency impulse number Pt by the straight line expression formula of two point form, is specially:
When first temperature T 1, the high-frequency impulse number that obtains described customization high-frequency crystal in M standard second burst length is P1; When second temperature T 2, the high-frequency impulse number that obtains described customization high-frequency crystal in M standard second burst length is P2;
Then temperature T in this customization high-frequency crystal unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a=(P1-P2)/[M* (T1-T2)]; B=(P1T1-P2T2)/[M (T1-T2)].
Need to prove,, obtain corresponding temperature T and the expression formula of high-frequency impulse number Pt then because therefore the slope difference of the straight line of every section broken line correspondence, can search corresponding broken line by temperature T.
Be understandable that, can obtain high-frequency impulse number in the unit interval by the high-frequency impulse number in M the standard second pulse.When M numerical value was big more, the high-frequency impulse number in the unit interval of acquisition was accurate more.
Pulse value subtracter 104 is Pt1 and Pt2 relatively;
When Pt1 greater than Pt2, pulse per second (PPS) correction factor generator 105 is regulated the narrowed width of the pulse per second (PPS) that RTC circuit 106 produce; Otherwise the width of regulating the pulse per second (PPS) of RTC circuit 106 generations broadens; Equate with theoretical high-frequency impulse number Pt2 up to the high-frequency impulse number Pt1 that reads.
The device of the clock crystal oscillator closed loop thermal compensation that the utility model provides, by customizing the pulse per second (PPS) that high high frequency quartz crystal is accurately constantly proofreaied and correct the 32768Hz quartz crystal, the number of the high-frequency pulse signal that reads in the time gate that produces at the 32768Hz quartz crystal is with the high-frequency impulse number is identical accurately in theory.Owing to can under arbitrary temp, calibrate, so the utility model can compensate the 32768Hz quartz crystal owing to the different frequency departures that produce of temperature in the wide temperature range very much to the 32768Hz quartz crystal; Because the utility model has adopted the closed loop thermal compensation way, the frequency-temperature characteristic curve shape of its process and clock crystal is irrelevant, does not therefore require the consistency of clock crystal; Because the utility model only needs two crystal and a small-scale digit chip just can realize, so cost is lower, corresponding volume is also less.
Referring to Fig. 3, this figure is device embodiment two structure charts that the utility model provides.
What present embodiment provided realizes that based on high-frequency crystal the device of clock crystal oscillator closed loop thermal compensation can also comprise variations in temperature step decoder 110; Be used for controlling high-frequency counter 102, pulse value subtracter 104, demarcation umber of pulse decoder 103, pulse per second (PPS) correction factor generator 105 and RTC circuit 106 and whether start work.When temperature surpasses preset range, just carry out clock correction, temperature is compensated.The purpose of doing like this is for power saving, especially when whole device is powered by battery.
Described variations in temperature step decoder 110 is searched corresponding preset range by temperature step table, and described temperature step table is stored in the described variations in temperature step decoder 110 in advance;
Described variations in temperature step decoder 110 judges whether variation of temperature surpasses the preset range of Current Temperatures correspondence; Particularly, the digital signal of the temperature that variations in temperature step decoder 110 sends current AD converter 108 and the digital signal of previous temperature compare, and determine whether the variation of temperature value surpasses preset range.
When surpassing preset range, open high-frequency counter 102, pulse value subtracter 104, demarcate umber of pulse decoder 103, pulse per second (PPS) correction factor generator 105 and RTC circuit 106; When not surpassing preset range, close high-frequency counter 102, pulse value subtracter 104, demarcate umber of pulse decoder 103, pulse per second (PPS) correction factor generator 105 and RTC circuit 106.
In the present embodiment, preferred described temperature step table for-10 ℃ of following temperature step values be 0.2 ℃ ,-10～+ 10 ℃ temperature step values be 0.3 ℃ ,+10～+ 30 ℃ of temperature step values be 0.4 ℃ ,+30～+ 50 ℃ of temperature step values be 0.3 ℃ ,+temperature step value is 0.2 ℃ more than 50 ℃.
Be understandable that according to different customization high-frequency crystals, the concrete numerical value in the corresponding temperature step table can be adjusted according to the empirical value of test.
The device that provides among another embodiment of the utility model also comprises 64 frequency multiplier circuits 111; As shown in Figure 3, how to realize clock correction below in conjunction with Fig. 3 detailed introduction.
Described 64 frequency multiplier circuits 111 carry out 64 frequencys multiplication with the clock frequency that 32768Hz quartz crystal 109 produces, and the signal after the frequency multiplication is sent to RTC circuit 106.
The width of the pulse per second (PPS) that correction factor N that RTC circuit 106 sends according to pulse per second (PPS) correction factor generator 105 and P adjust output; RTC circuit 106 produces pulse per second (PPS) and is specially: the clock signal that 32768Hz quartz crystal 109 produces is carried out 32768 ± Fractional-N frequency and delay or shifted to an earlier date P the signal after the described frequency multiplication.
The clock frequency that 64 frequency multiplier circuits 111 produce 32768Hz quartz crystal 109 is carried out 64 frequencys multiplication, and to obtain one be the signal of 2.097152MHz with 32768Hz signal Synchronization and frequency, and 64 frequency multiplier circuits 111 send to RTC circuit 106 with the signal 2.097152MHz signal after the frequency multiplication.
Need to prove that adjusted pulse per second (PPS) is exported in the closed loop thermal compensation method that the utility model provides, the while is as the benchmark of new scheduled time gate.For example, the M value of scheduled time gate is 5 seconds, then with the time gate of adjusted 5 pulse per second (PPS)s as the counting high-frequency impulse.
The customization high frequency quartz oscillator that customization high-frequency crystal in the present embodiment can provide for special manufacturer, optimized frequency is the above quartz oscillator of 1MHz, what the utility model was selected for use is the quartz oscillator of 16MHz.
The device that the utility model provides can be realized accurately clock being realized temperature-compensating in the wide temperature range.
The above only is preferred embodiment of the present utility model, is not the utility model is done any pro forma restriction.Though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model.Any those of ordinary skill in the art, do not breaking away under the technical solutions of the utility model scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solutions of the utility model are made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solutions of the utility model, all still belongs in the scope of technical solutions of the utility model protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present utility model.
Claims (6)
1. device of realizing the compensation of clock crystal oscillator closed loop thermal based on high-frequency crystal, it is characterized in that, comprising: customization high-frequency crystal, high-frequency counter, demarcation umber of pulse decoder, pulse value subtracter, pulse per second (PPS) correction factor generator, real-time clock RTC circuit, temperature sensor, AD converter, 32768Hz quartz crystal;
The temperature sensor measurement ambient temperature sends to AD converter with the temperature of measuring, and AD converter is converted to digital signal with the ambient temperature of temperature sensor measurement and sends to and demarcate the umber of pulse decoder;
The frequency-temperature characteristic curve of described customization high-frequency crystal is a sectional broken line, is straight line in every section broken line; Temperature T in every section broken line in the unit interval and the expression formula of high-frequency impulse number Pt are: Pt=(a*T+b); Wherein, a, b are constant;
Real-time clock RTC circuit produces the pulse per second (PPS) that is produced by the vibration of 32768Hz quartz crystal;
When temperature T, high-frequency counter reads the high-frequency impulse number Pt1 that the described customization high-frequency crystal in the scheduled time gate that real-time clock RTC circuit produces produces;
When temperature T, demarcate the umber of pulse decoder and calculate the theoretical high-frequency impulse number Pt2 of described customization high-frequency crystal in described scheduled time gate by Pt=(a*T+b); Described demarcation umber of pulse decoder is stored a, b corresponding in every section broken line in advance; One group of a of every section broken line correspondence, b value;
The pulse value subtracter is Pt1 and Pt2 relatively;
When Pt1 greater than Pt2, pulse per second (PPS) correction factor generator is regulated the narrowed width of the pulse per second (PPS) that the RTC circuit produces; Otherwise the width of regulating the pulse per second (PPS) of RTC circuit generation broadens; Equate with theoretical high-frequency impulse number Pt2 up to the high-frequency impulse number Pt1 that reads.
2. the device based on the compensation of high-frequency crystal realization clock crystal oscillator closed loop thermal according to claim 1 is characterized in that this device also comprises 64 frequency multiplier circuits;
Described 64 frequency multiplier circuits carry out 64 frequencys multiplication with the clock frequency that the 32768Hz quartz crystal produces, and the signal after the frequency multiplication is sent to the RTC circuit, the width of the pulse per second (PPS) that correction factor N that the RTC circuit sends according to pulse per second (PPS) correction factor generator and P adjust output; The RTC circuit produces pulse per second (PPS) and is specially: the clock signal that the 32768Hz quartz crystal produces is carried out 32768 ± Fractional-N frequency and delay or shifted to an earlier date P the signal after the described frequency multiplication.
3. the device based on the compensation of high-frequency crystal realization clock crystal oscillator closed loop thermal according to claim 1 is characterized in that this device also comprises variations in temperature step decoder;
Described variations in temperature step decoder, section regularly receives the digital signal of the temperature that AD converter sends to schedule; Judge whether variation of temperature surpasses preset range, when surpassing preset range, open high-frequency counter, pulse value subtracter, demarcate umber of pulse decoder and pulse per second (PPS) correction factor generator; When not surpassing preset range, close high-frequency counter, pulse value subtracter, demarcate umber of pulse decoder and pulse per second (PPS) correction factor generator.
4. the device of realizing the compensation of clock crystal oscillator closed loop thermal based on high-frequency crystal according to claim 3, it is characterized in that, described variations in temperature step decoder is searched corresponding preset range by temperature step table, and described temperature step table is stored in the described variations in temperature step decoder in advance;
Described variations in temperature step decoder judges whether variation of temperature surpasses the preset range of Current Temperatures correspondence; When surpassing preset range, open high-frequency counter, pulse value subtracter, demarcate umber of pulse decoder, pulse per second (PPS) correction factor generator RTC circuit; When not surpassing preset range, close high-frequency counter, pulse value subtracter, demarcate umber of pulse decoder, pulse per second (PPS) correction factor generator and RTC circuit.
5. the device of realizing the compensation of clock crystal oscillator closed loop thermal based on high-frequency crystal according to claim 4, it is characterized in that, described temperature step table for-10 ℃ of following temperature step values be 0.2 ℃ ,-10～+ 10 ℃ temperature step values be 0.3 ℃ ,+10～+ 30 ℃ of temperature step values be 0.4 ℃ ,+30～+ 50 ℃ of temperature step values be 0.3 ℃ ,+temperature step value is 0.2 ℃ more than 50 ℃.
6. according to each described device of claim 1-5, it is characterized in that the frequency of described customization high-frequency crystal is 16MHz based on the compensation of high-frequency crystal realization clock crystal oscillator closed loop thermal.
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| CN2011201526073U CN202059372U (en) | 2011-05-13 | 2011-05-13 | Device capable of realizing closed-loop temperature compensation of clock crystal oscillator based on high-frequency crystals |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376356A (en) * | 2012-04-27 | 2013-10-30 | 拉碧斯半导体株式会社 | Semiconductor device, measurement device, and correction method |
| CN104218891A (en) * | 2013-06-05 | 2014-12-17 | 上海华虹集成电路有限责任公司 | Closed-loop temperature compensation device for clock crystal oscillator |
| CN106679328A (en) * | 2017-02-22 | 2017-05-17 | 合肥舒实工贸有限公司 | Temperature controller for refrigerator |
| CN106856403A (en) * | 2015-12-08 | 2017-06-16 | 上海贝岭股份有限公司 | real-time clock generation device and method |
| CN111614323A (en) * | 2019-02-26 | 2020-09-01 | 精工爱普生株式会社 | Oscillator, electronic apparatus, and moving object |
-
2011
- 2011-05-13 CN CN2011201526073U patent/CN202059372U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376356A (en) * | 2012-04-27 | 2013-10-30 | 拉碧斯半导体株式会社 | Semiconductor device, measurement device, and correction method |
| CN104218891A (en) * | 2013-06-05 | 2014-12-17 | 上海华虹集成电路有限责任公司 | Closed-loop temperature compensation device for clock crystal oscillator |
| CN106856403A (en) * | 2015-12-08 | 2017-06-16 | 上海贝岭股份有限公司 | real-time clock generation device and method |
| CN106679328A (en) * | 2017-02-22 | 2017-05-17 | 合肥舒实工贸有限公司 | Temperature controller for refrigerator |
| CN111614323A (en) * | 2019-02-26 | 2020-09-01 | 精工爱普生株式会社 | Oscillator, electronic apparatus, and moving object |
| CN111614323B (en) * | 2019-02-26 | 2023-09-29 | 精工爱普生株式会社 | Oscillator, electronic apparatus, and moving object |
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Granted publication date: 20111130 |