CN209764109U - optical fiber gyroscope - Google Patents
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- CN209764109U CN209764109U CN201920986730.1U CN201920986730U CN209764109U CN 209764109 U CN209764109 U CN 209764109U CN 201920986730 U CN201920986730 U CN 201920986730U CN 209764109 U CN209764109 U CN 209764109U
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Abstract
The utility model provides a fiber optic gyroscope, include: microcontroller and electric connection's phase-locked ware, laser modulation transmitter, optic fibre ring, mixing receiver and filter amplifier in proper order, the phase-locked ware the laser modulation transmitter mixing receiver filtering amplifier all with microcontroller electric connection, the phase-locked ware is electric connection still mixing receiver. According to the technical scheme of the utility model, through adopting optical fiber ring transmission principle and difference frequency to survey the looks principle and realize measuring the rotation angle function, replace the integrated optical modulator of the Y waveguide that is expensive relatively, can reduce the cost of fiber gyroscope, be favorable to this fiber gyroscope's civilization popularization.
Description
Technical Field
The utility model relates to a gyroscope technical field especially relates to a fiber optic gyroscope.
Background
The optical fiber gyroscope is an angular rate measuring instrument developed based on the Sagnac effect, has the technical advantages of simple structure, impact resistance and large dynamic range, has the using effects of long service life and high reliability, and is widely applied to a plurality of fields such as aerospace, robot control, petroleum and coal mining and the like.
At present, the optical path part of the fiber-optic gyroscope on the market mainly consists of 5 devices, namely a light source, an optical fiber coupler, a Y waveguide integrated optical modulator, an optical fiber ring and a photoelectric detector. However, the Y waveguide integrated optical modulator is relatively expensive, so that the optical fiber gyroscope is relatively expensive and cannot be popularized for civilian use.
SUMMERY OF THE UTILITY MODEL
in view of this, the present invention provides an optical fiber gyroscope, which is advantageous for civilization popularization by adopting the difference frequency phase measurement principle to measure the rotation angle and replacing the relatively expensive Y waveguide integrated optical modulator.
An embodiment of the utility model provides an optical fiber gyroscope, include: the phase lock, the laser modulation transmitter, the frequency mixing receiver and the filter amplifier are all electrically connected with the microcontroller, and the phase lock is also electrically connected with the frequency mixing receiver;
the phase lock is used for generating a driving clock signal and a local oscillator clock signal and also outputting a synchronous clock to the microcontroller;
The laser modulation transmitter is used for modulating and transmitting laser according to the driving clock signal and guiding the obtained modulated laser into the optical fiber ring;
The frequency mixing receiver is used for receiving the modulated laser and mixing the modulated laser with the local oscillator clock signal to output a mixing signal;
and the microcontroller is used for sampling the frequency mixing signals processed by the filter amplifier and calculating the phase difference and the rotation angle of the optical fiber ring according to the obtained sampling signals.
In the optical fiber gyroscope, optionally, the laser modulation transmitter includes a driving modulation circuit and a laser diode, the driving modulation circuit is electrically connected to the microcontroller and the phase locker respectively, and the laser diode is electrically connected to the driving modulation circuit.
In the optical fiber gyro, optionally, the method further includes: the LED light-emitting diode is electrically connected with the driving modulation circuit, the driving modulation circuit is used for modulating LED emitted light according to the driving clock signal, and the mixing receiver is also used for directly receiving the modulated LED emitted light.
In the above optical fiber gyroscope, optionally, the mixing receiver includes a conditioning circuit and an external photoelectric receiver, the conditioning circuit is connected to the phase lock device and the external photoelectric receiver, respectively, and the external photoelectric receiver is connected to the filter amplifier;
The conditioning circuit is used for conditioning the local oscillator clock signal;
And the outer photoelectric receiver is used for receiving the modulated laser and mixing the modulated laser with the conditioned local oscillator clock signal.
in the optical fiber gyroscope, optionally, the external photoelectric receiver includes a voltage bias circuit and a photodiode, the voltage bias circuit is electrically connected to the microcontroller and the photodiode respectively, and the photodiode is electrically connected to the filter amplifier.
in the optical fiber gyro, optionally, the method further includes: the spectroscope is arranged between the laser diode and the optical fiber ring, and the inner photoelectric receiver is respectively and electrically connected with the conditioning circuit and the filter amplifier;
The spectroscope is used for splitting the modulated laser into two paths, one path is guided into the optical fiber ring, and the other path is received by the inner photoelectric receiver.
In the optical fiber gyro, optionally, the method further includes: a temperature sensor disposed at a preset position from the photodiode;
the temperature sensor is used for detecting the temperature of the photodiode so that the microcontroller can correspondingly adjust the bias voltage of the photodiode.
In the optical fiber gyroscope, optionally, a focusing lens is disposed between the laser diode and the optical fiber ring, and the focusing lens is configured to focus the modulated laser light and guide the focused laser light into the optical fiber ring.
In the above optical fiber gyro, optionally, the phase locker is a phase-locked loop or a digital frequency synthesizer.
In the optical fiber gyro, optionally, the method further includes: and the display and/or the input panel are electrically connected with the microcontroller.
The utility model discloses an optical fiber gyroscope produces drive clock signal and the local oscillator signal that is used for modulating laser through the phase-locked device to utilize modulation laser signal and the local oscillator signal through the transmission of optical fiber ring to carry out the mixing in order to obtain the difference frequency signal, thereby utilize the difference frequency to survey the phase principle and realize measuring the rotation angle purpose, replaced the integrated optical modulator of Y waveguide expensive relatively, can reduce optical fiber gyroscope's cost, be favorable to this optical fiber gyroscope's civilization popularization.
In order to make the aforementioned and other objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
in order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a first schematic structural diagram of an optical fiber gyroscope according to an embodiment of the present invention;
Fig. 2 is a second schematic structural diagram of the optical fiber gyroscope according to the embodiment of the present invention;
fig. 3 shows a third schematic structural diagram of the optical fiber gyroscope according to the embodiment of the present invention.
Description of the main element symbols:
1. 2, 3-fiber optic gyroscopes; 10-a microcontroller; 11-a phase lock; 12-a laser modulation transmitter; 13-a fiber optic ring; 14-a mixer receiver; 15-a filter amplifier; 16-LED light emitting diodes; 17-a spectroscope; 18-an internal photoelectric receiver; 121-drive modulation circuit; 122-a laser diode; 131-a focusing lens; 141-a conditioning circuit; 142-a photodiode; 143-voltage bias circuit.
Detailed Description
reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the present embodiment provides an optical fiber gyroscope 1, which can be used for measuring a rotation angle or a rotation angular velocity in various situations, such as robot control, unmanned automatic driving, unmanned aerial vehicle control, and the like. The structure of the optical fiber gyro 1 will be described in detail below.
As shown in fig. 1, the optical fiber gyro 1 is mainly composed of a microcontroller 10, a phase lock 11, a laser modulation transmitter 12, a fiber loop 13, a mixer receiver 14, and a filter amplifier 15. Exemplarily, the microcontroller 10, the phase lock 11, the laser modulation transmitter 12, the fiber loop 13, the mixing receiver 14, and the filter amplifier 15 are electrically connected in sequence; the phase lock 11, the laser modulation transmitter 12, the mixing receiver 14, and the filter amplifier 15 are electrically connected to the microcontroller 10, respectively, and the phase lock 11 is also electrically connected to the filter amplifier 15.
in this embodiment, the phase lock 11 is mainly used for generating a driving clock signal and a local oscillator clock signal. In addition, the phase lock 11 outputs a synchronization clock to the microcontroller 10 to ensure clock synchronization of the microcontroller 10. Specifically, the phase lock 11 generates two paths of driving clock signals and local oscillating clock signals with stable phases and different frequencies, where the driving clock signals are mainly used for modulating laser, and the local oscillating clock signals are used as reference signals and can be used for performing frequency mixing processing with the modulated laser signals. Exemplarily, the phase lock 11 may be implemented by using a phase-locked loop PLL or a digital frequency synthesizer DDS, or may be implemented by using a programmable logic device such as a CPLD or an FPGA.
In this embodiment, the laser modulation transmitter 12 is configured to modulate the transmission laser light according to the driving clock signal output from the phase lock 11 and guide the modulated laser light into the fiber loop 13.
exemplarily, as shown in fig. 1, the laser modulation transmitter 12 includes a driving modulation circuit 121 and a laser diode 122, the driving modulation circuit 121 is electrically connected to the microcontroller 10 and the phase lock loop 11, respectively, and the laser diode 122 is electrically connected to the driving modulation circuit 121. For example, the driving modulation circuit 121 may be formed by a driving circuit such as a transistor and a modulator. In this embodiment, the driving modulation circuit 121 is configured to drive the laser diode 122 to emit laser light, and modulate the emitted laser light according to the driving clock signal output by the phase lock device 11, so as to obtain modulated laser light. It will be appreciated that the amplitude of the modulated laser will vary with the driving clock signal voltage.
In this embodiment, the optical fiber ring 13 is located between the laser modulation transmitter 12 and the frequency mixing receiver 14, and is used for transmitting the modulated laser light guided by the laser modulation transmitter 12 to the frequency mixing receiver 14, and further performing optical signal receiving and frequency mixing processing by the frequency mixing receiver 14. Exemplarily, as shown in fig. 1, a focusing lens 131 may be disposed between the laser diode 122 and the fiber loop 13, and the focusing lens 131 is used for focusing the modulated laser light output by the laser modulation transmitter 12 and guiding the focused laser light into the fiber loop 13.
It can be understood that, according to the principle of light transmission in the optical fiber, when the optical fiber ring 13 is in a stationary state, the distance transmitted by the laser is a fixed value, and when the optical fiber ring 13 is in a rotating state, the phase of the laser changes and the transmitted distance changes accordingly. For example, when the rotation direction of the fiber ring 13 coincides with the direction of laser light propagation, the distance of laser light propagation may be relatively large with respect to the distance in the stationary state; when the rotation direction of the optical fiber ring 13 is opposite to the laser transmission direction, the laser transmission distance is shortened accordingly. Therefore, the optical fiber gyro 1 of the present embodiment will measure the rotation angle or rotation angular velocity, etc. corresponding to the optical fiber ring 13 based on the difference frequency phase measurement method.
In this embodiment, the frequency mixing receiver 14 is configured to receive the modulated laser transmitted through the optical fiber ring 13 and perform photoelectric conversion to obtain a corresponding signal to be mixed.
Exemplarily, as shown in fig. 1, the mixer receiver 14 includes a conditioning circuit 141 and an external photoelectric receiver, the conditioning circuit 141 is connected to the phase-locked loop 11 and the external photoelectric receiver, and the external photoelectric receiver is connected to the filter amplifier 15. The conditioning circuit 141 is configured to perform signal conditioning, such as filtering, on the local oscillator clock signal output by the phase lock 11. The external photoelectric receiver is configured to receive the modulated laser transmitted through the optical fiber ring 13, and mix the modulated laser with the conditioned local oscillation clock signal, so as to finally output a mixed signal, which is also a difference frequency signal.
In this embodiment, the external photoelectric receiver includes a photodiode 142 and a voltage bias circuit 143, the voltage bias circuit 143 is electrically connected to the microcontroller 10 and the photodiode 142, respectively, and the photodiode 142 is electrically connected to the filter amplifier 15. Specifically, the voltage bias circuit 143 is used to provide a bias voltage required for the photodiode 142 to operate normally, and for example, a signal amplifier or the like may be used. The photodiode 142 is configured to receive the modulated laser light transmitted from the optical fiber ring 13 and mix the modulated laser light with the local oscillator clock signal output by the conditioning circuit 141 to obtain a mixed signal. In this embodiment, the filter amplifier 15 is configured to perform low-pass filtering on the output mixed signal to obtain a filtered mixed signal. Exemplarily, the filter amplifier 15 mainly includes a low pass filter and a signal amplifier. Considering that the filtered difference frequency signal is weak, the difference frequency signal can be amplified and then sent to the micro controller 10 for sampling, so that the sampling accuracy can be improved.
In this embodiment, the microcontroller 10 is configured to calculate a phase difference of the sampled mixed signals, and calculate a rotation angle of the optical fiber ring 13 according to the phase difference. For example, the microcontroller 10 may be embodied as a different type of microprocessor chip such as an MSC-51 series, STC series, MSP430 series, or ARM9/11 series.
Illustratively, the microcontroller 10 may acquire the mixed signal by ADC sampling, and then calculate the rotation angle or rotation angle rate of the fiber loop 13 according to the phase difference. Assume that the driving clock signal isThe local oscillator clock signal isAnd the micro-controller 10 samples the mixing signal astherefore, W is known from the mixing principle1＝SS-WOAnd then the phase difference can be calculatedAnd the rotation angle is calculated according to the phase difference of the static state and the phase difference of the rotating state of the optical fiber ring 13.
For example, the following algorithm may be employed: if the number of the optical fiber rings 13 is n, the radius of the optical fiber rings 13 is R, the frequency of the main control signal is f, wherein c is the speed of light, and when the optical fiber rings 13 are static, the corresponding static phase difference obtained by calculation isWhen the optical fiber ring 13 rotates, the corresponding rotation phase difference is calculated to beOn the premise of ensuring that other parameters are unchanged, the calculation formula of the rotation angle delta theta is as follows:
Of course, the rotation angle and the corresponding rotation angular velocity of the optical fiber ring 13 can also be calculated according to the above formula or other algorithms. The rotation angular velocity is a rotation angle in unit time.
It will be appreciated that when the fiber ring 13 is stationary, the distance over which the modulated laser light is transmitted is fixed, corresponding to a phase difference; when the optical fiber rotates, the transmission distance of the modulated laser changes, and a phase difference also corresponds to the transmission distance, so that the two phase differences can be used for realizing the angle measurement function of the optical fiber gyroscope 1. Preferably, sampling may be performed multiple times at each angle measurement to improve measurement accuracy, reduce calculation error, and the like.
further preferably, the optical fiber gyroscope 1 further comprises a temperature sensor electrically connected to the microcontroller 10, wherein the temperature sensor can be disposed at a predetermined position away from the photodiode 142. Specifically, the temperature sensor is used for detecting the temperature of the photodiode 142, so that the microcontroller 10 can correspondingly adjust the bias voltage of the photodiode 142 according to the temperature, so as to achieve the purpose of temperature compensation. Alternatively, the output of the laser diode 122 and the like may also be adjusted according to the temperature.
It can be understood that, according to the temperature characteristic of the photodiode 142, when the temperature is higher than a certain value, the output characteristic of the photodiode 142 is affected, and by detecting the temperature condition in real time, the bias voltage value of the photodiode 142 can be adjusted in time, and the output of the laser diode 122 can also be adjusted in time, so that the measurement error caused by the temperature change can be reduced, and the measurement accuracy of the optical fiber gyroscope 1 can be improved.
Further optionally, the optical fiber gyroscope 1 may further include a display for displaying the measurement result, the measurement state, and the like, and the display is electrically connected to the microcontroller 10. The display may exemplarily include a display driver and a display panel, and the display panel may employ, for example, an LCD liquid crystal display or the like.
Further optionally, the optical fiber gyroscope 1 may further include an input panel for receiving a user input command, wherein the input panel is electrically connected to the microcontroller 10. The input panel may exemplarily be an input key, a rotary button, a touch screen, or the like.
The optical fiber gyroscope of the embodiment can realize the measurement of angle measurement or angular rate by utilizing the principle of difference frequency phase measurement, and the like, and replaces a relatively expensive Y waveguide integrated optical modulator by using a circuit with lower cost, thereby greatly reducing the production cost of the optical fiber gyroscope, and being beneficial to the civilization popularization and the like of the optical fiber gyroscope.
Example 2
Referring to fig. 2, the present embodiment further provides an optical fiber gyroscope 2, which is different from the above embodiment 1 only in that the optical fiber gyroscope 2 further includes an LED 16, wherein the LED 16 is electrically connected to a driving modulation circuit 121, and the driving modulation circuit 121 modulates LED emitted light according to the driving clock signal output by the phase lock 11.
In this embodiment, the mixing receiver 14 is further configured to directly receive the modulated LED emitting light to form an inner optical path. It will be appreciated that the modulated laser light transmitted by the fibre optic ring 13 may form an external optical path. The accuracy of the measurement of the rotation angle of the optical fiber gyro 2 can be further improved by combining the measurement results of the internal optical path. Because this interior light path does not pass through optical fiber ring 13 transmission, directly carry out the mixing with modulated signal and local oscillator signal promptly after, can further calculate the error that exists with the mixing signal that obtains through optical fiber ring 13 transmission etc. and then improve this optical fiber gyroscope 2's overall measurement accuracy etc..
The structure of the optical fiber gyro 2 described above is the same as that of the optical fiber gyro in embodiment 1 described above, and the alternatives of the optical fiber gyro in embodiment 1 described above are also applicable to this embodiment, and therefore, detailed description thereof will be omitted.
Example 3
Referring to fig. 3, the present embodiment further provides an optical fiber gyroscope 3, which is different from the embodiment 1 only in that the optical fiber gyroscope 3 further includes a beam splitter 17 and an internal photoelectric receiver 18, wherein the beam splitter 17 is disposed between the laser diode 122 and the optical fiber ring 13, and the internal photoelectric receiver 18 is electrically connected to the filter amplifier 15. Exemplarily, the inner optical circuit receiver may adopt the same optical-electrical receiving structure as the outer optical circuit receiver in the above embodiment 1, and thus, the detailed description thereof is omitted.
In this embodiment, the beam splitter 17 is configured to split the modulated laser output by the laser modulation transmitter 12 into two paths, where one path leads to the optical fiber loop 13, and the other path is received by the internal photoelectric receiver 18. It is understood that the beam splitter 17 and the internal photoelectric receiver 18 will also be used to form an internal optical path, and the principle is similar to that of the above-described embodiment 2, i.e., the measurement accuracy of the rotation angle of the optical fiber gyro 3 can also be further improved by combining the measurement results of the internal optical path.
the structure of the optical fiber gyro 3 described above is the same as that of the optical fiber gyro in embodiment 1 described above, and the alternatives of the optical fiber gyro in embodiment 1 described above are also applicable to this embodiment, and therefore, detailed description thereof will be omitted.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above-described embodiments are merely illustrative of several embodiments of the present invention, which are described in detail and specific, but not intended to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. An optical fiber gyroscope, comprising: the phase lock, the laser modulation transmitter, the frequency mixing receiver and the filter amplifier are all electrically connected with the microcontroller, and the phase lock is also electrically connected with the frequency mixing receiver;
The phase lock is used for generating a driving clock signal and a local oscillator clock signal and also outputting a synchronous clock to the microcontroller;
The laser modulation transmitter is used for modulating and transmitting laser according to the driving clock signal and guiding the obtained modulated laser into the optical fiber ring;
The frequency mixing receiver is used for receiving the modulated laser and mixing the modulated laser with the local oscillator clock signal to output a mixing signal;
And the microcontroller is used for sampling the frequency mixing signals processed by the filter amplifier and calculating the phase difference and the rotation angle of the optical fiber ring according to the obtained sampling signals.
2. The fiber optic gyroscope of claim 1, wherein the laser modulation transmitter includes a drive modulation circuit and a laser diode, the drive modulation circuit is electrically connected to the microcontroller and the phase locker, respectively, and the laser diode is electrically connected to the drive modulation circuit.
3. The optical fiber gyroscope of claim 2, further comprising: the LED light-emitting diode is electrically connected with the driving modulation circuit, the driving modulation circuit is used for modulating LED emitted light according to the driving clock signal, and the mixing receiver is also used for directly receiving the modulated LED emitted light.
4. The fiber optic gyroscope of claim 2, wherein the mixer receiver includes a conditioning circuit and an external photoelectric receiver, the conditioning circuit being connected to the phase-locker and the external photoelectric receiver, respectively, the external photoelectric receiver being connected to the filter amplifier;
The conditioning circuit is used for conditioning the local oscillator clock signal;
and the outer photoelectric receiver is used for receiving the modulated laser and mixing the modulated laser with the conditioned local oscillator clock signal.
5. the fiber optic gyroscope of claim 4, wherein the external photoelectric receiver comprises a voltage bias circuit and a photodiode, the voltage bias circuit electrically connecting the microcontroller and the photodiode, respectively, the photodiode electrically connecting the filter amplifier.
6. The optical fiber gyroscope of claim 4, further comprising: a spectroscope and an inner photoelectric receiver, wherein the spectroscope is arranged between the laser diode and the optical fiber ring, the inner photoelectric receiver is respectively and electrically connected with the conditioning circuit and the filter amplifier,
The spectroscope is used for splitting the modulated laser into two paths, one path is guided into the optical fiber ring, and the other path is received by the inner photoelectric receiver.
7. the optical fiber gyroscope of claim 5, further comprising: a temperature sensor disposed at a preset position from the photodiode,
The temperature sensor is used for detecting the temperature of the photodiode so that the microcontroller can correspondingly adjust the bias voltage of the photodiode.
8. The fiber optic gyroscope of claim 2, wherein a focusing lens is disposed between the laser diode and the fiber ring, and the focusing lens is configured to focus the modulated laser light and guide the focused laser light into the fiber ring.
9. the optical fiber gyroscope of claim 1, wherein the phase-locker is a phase-locked loop or a digital frequency synthesizer.
10. the optical fiber gyroscope of claim 1, further comprising: and the display and/or the input panel are electrically connected with the microcontroller.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186449A (en) * | 2019-06-27 | 2019-08-30 | 深圳市度彼电子有限公司 | Fibre optic gyroscope |
| CN110186449B (en) * | 2019-06-27 | 2024-05-31 | 深圳市长毛象电子有限公司 | Optical fiber gyroscope |
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2019
- 2019-06-27 CN CN201920986730.1U patent/CN209764109U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186449A (en) * | 2019-06-27 | 2019-08-30 | 深圳市度彼电子有限公司 | Fibre optic gyroscope |
| CN110186449B (en) * | 2019-06-27 | 2024-05-31 | 深圳市长毛象电子有限公司 | Optical fiber gyroscope |
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Effective date of registration: 20230131 Address after: 518000 Room 601, building B, Qiaode science and Technology Park, No. 7, West District, Guangming Gaoxin Park, Tianliao community, Yutang street, Guangming District, Shenzhen, Guangdong Patentee after: Shenzhen changmaoxiang Electronics Co.,Ltd. Address before: 518000 Shenzhen, Guangdong Guangming New District Gongming office, Tian Liao community guangguangxin Park West seven, Qiao de science and Technology Park building, six B building. Patentee before: SHENZHEN DOBIY ELECTRONIC Co.,Ltd. |