CN111540158B - Smoke alarm with condensation identification function and use method - Google Patents
Smoke alarm with condensation identification function and use method Download PDFInfo
- Publication number
- CN111540158B CN111540158B CN202010461860.0A CN202010461860A CN111540158B CN 111540158 B CN111540158 B CN 111540158B CN 202010461860 A CN202010461860 A CN 202010461860A CN 111540158 B CN111540158 B CN 111540158B
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- bin
- smoke
- receiving tube
- condensation
- tube
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
Abstract
The invention relates to a smoke alarm with a condensation identification function and a use method thereof, wherein the smoke alarm comprises a shell; a smoke detection bin is fixedly arranged in the shell; the smoke detection bin is fixedly provided with a condensation identification bin; the smoke detection bin is provided with a first smoke inlet; a transmitting tube, a first receiving tube and a partition plate are fixedly arranged in the smoke detection bin; the condensation identification bin is provided with a light inlet channel and a light transmission sheet; a reflecting column and a second receiving tube are fixedly arranged in the condensation identification bin; the reflection column is used for reflecting the detection light rays emitted by the emission tube, and the second receiving tube is not positioned in the emergent area of the light rays reflected by the reflection column; the second receiving pipe is positioned at the middle upper part of the condensation identification bin; the condensation identification bin is provided with an air inlet; the housing is provided with a plurality of second smoke inlets; a control board is also arranged in the shell; the control board is used for outputting an alarm signal when the difference value between the reverse current value of the second receiving tube and the reverse current value of the first receiving tube is larger than a trigger threshold value.
Description
Technical Field
The invention relates to the technical field of smoke alarms, in particular to a smoke alarm with a condensation identification function and a use method thereof.
Background
The photoelectric smoke-sensing fire detector uses smoke as a main detection object and is suitable for places with smoldering stages in the initial stage of fire. The photosensitive element and the optical darkroom are main components of the smoke-sensing fire detector, the photosensitive element consists of a plurality of transmitting pipes and receiving pipes, and under normal conditions, light rays emitted by the transmitting pipes cannot be received by the receiving pipes; when the smoke enters the optical darkroom, the smoke particles have a scattering effect on the light, so that part of the light emitted by the emitting tube is scattered on the receiving tube, the receiving tube receives the optical signal and transmits the optical signal to the central chip, and an alarm is triggered.
However, in the actual use process, the condensation is generated in the optical darkroom under the influence of the change of the ambient temperature, the condensation generates a diffuse reflection effect on the light emitted by the emitting tube, and the receiving tube receives part of the diffuse reflected light, so that false alarm is finally caused. To cope with this problem, many manufacturers apply antifogging agents in the optical dark room, but antifogging agents are effective only for a period of time, and dust in the optical dark room is often cleaned when in use, the coating is easily damaged, and the anti-dew effect is further impaired.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art and provides a smoke alarm with a condensation identification function and a use method of the smoke alarm.
The technical scheme adopted for solving the technical problems is as follows:
in one aspect, a smoke alarm with condensation identification function is provided, comprising a housing; wherein, the inside of the shell is fixedly provided with a smoke detection bin; the interior of the smoke detection bin is fixedly provided with a condensation identification bin;
the side surface of the smoke detection bin is provided with a plurality of first smoke inlets; the first smoke inlet is communicated with the interior of the smoke detection bin; the smoke detection bin is internally fixedly provided with a transmitting tube for transmitting detection light obliquely upwards, a first receiving tube for receiving scattered light when smoke scatters the detection light transmitted by the transmitting tube, and a partition plate for preventing the detection light emitted by the side surface of the transmitting tube from being emitted to the first receiving tube;
the side surface of the condensation identification bin is provided with a light inlet channel for penetrating detection light emitted by the emission tube and a light transmission sheet for shielding the light inlet channel; the light-transmitting sheet is fixed with the condensation identification bin; the inside of the condensation identification bin is fixedly provided with a non-circular reflecting column which is opposite to the light-transmitting sheet, and a second receiving tube which is attached to the reflecting column and used for receiving diffuse reflection light when the condensation diffusely reflects the detection light emitted by the emitting tube; the reflection column is used for reflecting the detection light rays emitted by the emission tube, and the second receiving tube is not positioned in the emergent area of the light rays reflected by the reflection column; the second receiving pipe is positioned at the middle upper part of the condensation identification bin; the lower surface of the condensation identification bin is provided with an air inlet for air to enter;
a plurality of second smoke inlets are formed in the side surface of the shell; the second smoke inlet is communicated with the interior of the shell; a control board is also arranged in the shell; the transmitting tube, the first receiving tube and the second receiving tube are electrically connected with the control panel and controlled by the control panel; the control board is used for outputting an alarm signal when the difference value between the reverse current value of the second receiving tube and the reverse current value of the first receiving tube is larger than a trigger threshold value.
On the other hand, the application method of the smoke alarm is provided, and the smoke alarm with the condensation identification function is based on the smoke alarm, and comprises the following steps:
the transmitting tube transmits detection light;
acquiring a first reverse current value corresponding to the first receiving tube and a second reverse current value corresponding to the second receiving tube;
if the first receiving tube and the second receiving tube have no reverse current change, the control panel does not act; if the first receiving tube and the second receiving tube have reverse current change, and the difference value of the first reverse current value and the second reverse current value is not larger than a preset trigger threshold value, the control panel does not act; if the first receiving tube and the second receiving tube are provided with reverse current changes, and the difference value of the first reverse current value and the second reverse current value is larger than a preset trigger threshold value, the control panel outputs an alarm signal.
The invention has the beneficial effects that: the false alarm condition is effectively avoided, and specifically, the second receiving tube is arranged to become a comparison group of the first receiving tube; the condensation identification bin is arranged in the smoke detection bin, so that the whole structure is smaller and more compact; only one group of emission pipes are arranged to meet the requirements, so that the material cost is reduced; the light-transmitting sheet avoids air convection, and achieves the purposes of light transmission and air impermeability; aiming at the condensation identification bin, the condensation identification bin has no convection condition, and the second receiving tube is positioned at the higher position of the condensation identification bin, so that smoke cannot enter an optical sensitive area of the condensation identification bin, and air containing water vapor is ensured to enter the optical sensitive area; aiming at the smoke detection bin, the smoke detection bin is provided with convection conditions, so that smoke can enter the smoke detection bin through the first smoke inlet; therefore, compared with the smoke detection bin, the condensation identification bin has no smoke in the interior.
When no condensation exists, the detection light rays emitted by the emission tube are reflected by the reflection column, and the second receiving tube is not in the emergent area of the light rays reflected by the reflection column, so that no reverse current change exists in the second receiving tube; at this time, if the first receiving tube has reverse current change, the first receiving tube can confirm that smoke enters the smoke detection bin as condensation interference is eliminated, and the control panel outputs alarm information so as to trigger an alarm subsequently;
when the condensation exists, the condensation is attached to the reflecting column, and the detection light rays emitted by the emitting tube are diffusely reflected by the condensation, so that the reverse current of the second receiving tube is changed; the smoke detection bin also has condensation, so that the reverse current of the first receiving tube also changes, if no smoke exists at the moment, the reverse current value of the second receiving tube and the reverse current value of the first receiving tube tend to be the same, and the control panel does not act because the difference value of the two values is smaller than the trigger threshold; if the smoke detection bin is in smoke at the moment, the smoke can scatter detection light rays emitted by the emitting tube, so that reverse current of the first receiving tube is greatly changed, the difference value between the reverse current value of the second receiving tube and the reverse current value of the first receiving tube is larger than a trigger threshold value, and the control panel outputs an alarm signal to trigger an alarm.
Therefore, the smoke alarm can effectively eliminate false alarm caused by condensation, and is effective for a long time and long in service life compared with the traditional coating anti-fog layer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, in which the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained by those skilled in the art without inventive effort:
FIG. 1 is an exploded view of a smoke alarm with condensation identification function according to an embodiment of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
FIG. 3 is a cross-sectional view of a smoke alarm with condensation identification according to a first embodiment of the present invention;
fig. 4 is a sectional view of a smoke alarm with condensation recognition function according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following description will be made in detail with reference to the technical solutions in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
Example 1
The embodiment of the invention provides a smoke alarm with a condensation identification function, which is shown in figures 1-3 and comprises a shell 10; a smoke detection bin 11 is fixedly arranged in the shell 10; the interior of the smoke detection bin 11 is fixedly provided with a condensation identification bin 12;
the side surface of the smoke detection cartridge 11 is provided with a plurality of first smoke inlets 180; the first smoke inlet 180 communicates with the interior of the smoke detection cartridge 11; the inside of the smoke detection bin 11 is fixedly provided with an emission tube 13 for emitting detection light obliquely upwards, a first receiving tube 14 for receiving scattered light when the detection light emitted by the smoke scattering emission tube 13 is emitted, and a partition plate 15 for preventing the detection light emitted by the side surface of the emission tube 13 from being emitted to the first receiving tube 14;
the side surface of the condensation identification bin 12 is provided with a light inlet channel 181 for penetrating detection light emitted by the emission tube 13 and a light transmitting sheet 16 for shielding the light inlet channel 181; the light-transmitting sheet 16 is fixed with the condensation identification bin 12; the condensation identification bin 12 is internally fixedly provided with a non-circular reflecting column 17 which is opposite to the light-transmitting sheet 16, and a second receiving tube 18 which receives diffuse reflection light when the detecting light emitted by the condensation diffuse reflection emitting tube 13 is attached to the reflecting column 17; the reflecting column 17 is used for reflecting the detection light rays emitted by the emitting tube 13, and the second receiving tube 18 is not positioned in the emergent area of the light rays reflected by the reflecting column 17; the second receiving pipe 18 is positioned at the middle upper part of the condensation identification bin 12; the lower surface of the condensation identification bin 12 is provided with an air inlet 182 for air to enter;
the side surface of the housing 10 is provided with a plurality of second smoke inlets 183; the second smoke inlet 183 communicates with the interior of the housing 10; the inside of the housing 10 is also provided with a control board 19; the transmitting tube 13, the first receiving tube 14 and the second receiving tube 18 are all electrically connected with and controlled by the control board 19; the control board 19 is used for outputting an alarm signal when the difference value between the reverse current value of the second receiving tube 18 and the reverse current value of the first receiving tube 14 is larger than the trigger threshold. The smoke alarm effectively avoids the false alarm condition, and particularly, the second receiving tube 18 is arranged to become a comparison group of the first receiving tube 14; the condensation identification bin 12 is arranged in the smoke detection bin 11, so that the whole structure is smaller and more compact; only one group of emission pipes 13 is arranged to meet the requirements, so that the material cost is reduced; the light-transmitting sheet 16 avoids air convection, and achieves the purposes of light transmission and air impermeability; for the condensation identification bin 12, firstly, convection conditions are not provided, and secondly, the second receiving tube 18 is positioned at the higher position of the condensation identification bin 12, so that smoke cannot enter an optical sensitive area of the condensation identification bin 12, and air containing water vapor is ensured to enter the optical sensitive area; for the smoke detection chamber 11, convection conditions are provided to ensure that smoke can enter the smoke detection chamber 11 through the first smoke inlet 180; therefore, the condensation identification chamber 12 does not have smoke in the interior as compared with the smoke detection chamber 11.
When there is no condensation, the detection light emitted by the emission tube 13 is reflected by the reflection column 17, and the second receiving tube 18 is not in the emergent area of the light reflected by the reflection column 17, so that there is no reverse current change of the second receiving tube 18; at this time, if the first receiving tube 14 has a reverse current change, it can be confirmed that smoke enters the smoke detection bin 11 because condensation interference is eliminated, and the control panel 19 outputs alarm information to trigger an alarm subsequently;
when the condensation exists, the condensation is attached to the reflecting column 17, and the detection light emitted by the emitting tube 13 is diffusely reflected by the condensation, so that the reverse current of the second receiving tube 18 is changed; since the smoke detection bin 11 also has condensation, the reverse current of the first receiving tube 14 also changes, if no smoke exists at this time, the reverse current value of the second receiving tube 18 and the reverse current value of the first receiving tube 14 tend to be the same, and the control panel 19 does not act because the difference value of the two values is smaller than the trigger threshold; if the smoke detection bin 11 is in smoke at this time, the smoke scatters the detection light emitted by the emission tube 13, so that the reverse current of the first receiving tube 14 is greatly changed, the difference value between the reverse current value of the second receiving tube 18 and the reverse current value of the first receiving tube 14 is greater than the trigger threshold, and the control panel 19 outputs an alarm signal to trigger an alarm.
Therefore, the smoke alarm can effectively eliminate false alarm caused by condensation, and is effective for a long time and long in service life compared with the traditional coating anti-fog layer.
As shown in fig. 1 and 3, the reflecting columns 17 are triangular prisms, and are provided with a plurality of groups, and when reflecting, a plurality of side surfaces can participate in reflection; three sets of side surfaces of the reflecting column 17, one of which is fixed to the condensation identification chamber 12, are directed toward the light transmitting sheet 16 and the other is directed toward the second receiving tube 18.
As shown in fig. 3, the inner wall of the condensation identifying bin 12 provided with the reflecting column 17 is outwards inclined in a direction away from the second receiving tube 18, so that the detecting light of the transmitting tube 13 can be reflected obliquely upwards, and the second receiving tube 18 is more difficult to receive the detecting light emitted by the transmitting tube 13 under the condition of no condensation.
As shown in fig. 1 and 3, the control board 19 is fixed to the housing 10; the smoke detection bin 11 comprises an upper bin cover 110 and a lower bin body 111 which is tightly covered by matching with the upper bin cover 110; the lower bin body 111, the control panel 19 and the condensation identification bin 12 are all fixed with the upper bin cover 110; the partition plate 15 comprises an upper plate 112 and a lower plate 113 which are respectively fixed with the lower surface of the upper bin cover 110 and the inner bottom surface of the lower bin 111; the opposite side surfaces of the upper plate body 112 and the lower plate body 113 are respectively provided with a first mounting groove 184 matched with the tube body of the transmitting tube 13 and a second mounting groove 185 matched with the tube body of the first receiving tube 14, and when the device is mounted, the transmitting tube 13 and the first receiving tube 14 are respectively placed into the first mounting groove 184 and the second mounting groove 185, so that the upper bin cover 110 and the lower bin body 111 are covered, the upper plate body 112 and the lower plate body 113 are matched to clamp the transmitting tube 13 and the first receiving tube 14, and the device is convenient to mount and good in positioning.
As shown in fig. 2, the air inlets 182 are provided with a plurality of openings with diameters smaller than 1mm, so that air can enter conveniently and mosquitoes can be blocked outside the condensation identification bin 12.
As shown in fig. 1 and 3, the housing 10 includes an upper case cover 114, and a lower case 115 closely fitted with the upper case cover 114; the control plate 19 is fixedly arranged on one side surface of the upper shell cover 114 facing the lower shell 115; the smoke detection bin 11 is fixedly arranged on the lower surface of the control plate 19, when the smoke detection bin is installed, the control plate 19 is firstly fixed on the upper shell cover 114, then the smoke detection bin 11 is fixed on the control plate 19, and then the smoke detection bin 11, the control plate 19 and the upper shell cover 114 are assembled in the lower shell 115 together, so that the installation is convenient; the second smoke inlet 183 is located at the lower end of the lower housing 115.
As shown in fig. 1, the side wall of the condensation identification bin 12 is provided with a third mounting groove (not shown in the figure) which is matched with the pin of the second receiving tube 18, so that the installation is convenient; a third mounting slot (not shown) communicates with the outer surface of the condensation identification chamber 12 to facilitate electrical connection of the second receiving tube 18 to the control board 19.
Example two
The embodiment of the invention provides a smoke alarm with a condensation identification function, which is the same as the first embodiment and is not repeated, and the difference is that:
as shown in fig. 4, a light shielding plate 116 for preventing external light from directly irradiating the second receiving tube 18 is further fixedly arranged in the condensation identification bin 12, so that the influence of external ambient light on the second receiving tube 18 is reduced.
As shown in fig. 4, the light shielding plates 116 are provided with a plurality of groups and distributed in a staggered manner; two groups of light shielding plates 116 adjacent to each other in the vertical direction are distributed on two sides of the condensation identification bin 12, and the plurality of groups of light shielding plates 116 are matched to form a roundabout path, so that particles are difficult to enter into an optical sensitive area of the condensation identification bin 12.
Example III
The embodiment of the invention provides a use method of a smoke alarm, which comprises the following steps:
step S1: the emitting tube emits detection light.
Step S2: a first reverse current value corresponding to the first receiving tube and a second reverse current value corresponding to the second receiving tube are obtained.
Step S3: if the first receiving tube and the second receiving tube have no reverse current change, the control panel does not act; if the first receiving tube and the second receiving tube have reverse current change, and the difference value of the first reverse current value and the second reverse current value is not larger than a preset trigger threshold value, the control panel does not act; if the first receiving tube and the second receiving tube are provided with reverse current changes, and the difference value of the first reverse current value and the second reverse current value is larger than a preset trigger threshold value, the control panel outputs an alarm signal.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (10)
1. A smoke alarm with condensation identification function comprises a shell; the smoke detection bin is fixedly arranged in the shell; the interior of the smoke detection bin is fixedly provided with a condensation identification bin;
the side surface of the smoke detection bin is provided with a plurality of first smoke inlets; the first smoke inlet is communicated with the interior of the smoke detection bin; the smoke detection bin is internally fixedly provided with a transmitting tube for transmitting detection light obliquely upwards, a first receiving tube for receiving scattered light when smoke scatters the detection light transmitted by the transmitting tube, and a partition plate for preventing the detection light emitted by the side surface of the transmitting tube from being emitted to the first receiving tube;
the side surface of the condensation identification bin is provided with a light inlet channel for penetrating detection light emitted by the emission tube and a light transmission sheet for shielding the light inlet channel; the light-transmitting sheet is fixed with the condensation identification bin; the inside of the condensation identification bin is fixedly provided with a non-circular reflecting column which is opposite to the light-transmitting sheet, and a second receiving tube which is attached to the reflecting column and used for receiving diffuse reflection light when the condensation diffusely reflects the detection light emitted by the emitting tube; the reflection column is used for reflecting the detection light rays emitted by the emission tube, and the second receiving tube is not positioned in the emergent area of the light rays reflected by the reflection column; the second receiving pipe is positioned at the middle upper part of the condensation identification bin; the lower surface of the condensation identification bin is provided with an air inlet for air to enter;
a plurality of second smoke inlets are formed in the side surface of the shell; the second smoke inlet is communicated with the interior of the shell; a control board is also arranged in the shell; the transmitting tube, the first receiving tube and the second receiving tube are electrically connected with the control panel and controlled by the control panel; the control board is used for outputting an alarm signal when the difference value between the reverse current value of the second receiving tube and the reverse current value of the first receiving tube is larger than a trigger threshold value.
2. The smoke alarm with the condensation identification function according to claim 1, wherein the reflecting columns are triangular prisms and are provided with a plurality of groups; one of the three groups of side surfaces of the reflecting column is fixed with the condensation identification bin, the other side of the reflecting column faces the light-transmitting sheet, and the other side of the reflecting column faces the second receiving tube.
3. The smoke alarm with the condensation identification function according to claim 2, wherein the inner wall of the condensation identification bin provided with the reflecting column is outwards inclined in a direction away from the second receiving tube.
4. The smoke alarm with the condensation identification function according to claim 1, wherein a light shielding plate for preventing external light from directly irradiating the second receiving tube is further fixedly arranged in the condensation identification bin.
5. The smoke alarm with the condensation identification function according to claim 4, wherein a plurality of groups of the light shielding plates are arranged and distributed in a staggered manner; two groups of light shielding plates adjacent to each other in the vertical direction are distributed on two sides of the condensation identification bin.
6. The smoke alarm with condensation identification function according to claim 1, wherein the control board is fixed with the housing; the smoke detection bin comprises an upper bin cover and a lower bin body which is tightly covered by matching with the upper bin cover; the lower bin body, the control panel and the condensation identification bin are all fixed with the upper bin cover; the partition plate comprises an upper plate body and a lower plate body which are respectively fixed with the lower surface of the upper bin cover and the inner bottom surface of the lower bin body; the side surfaces of the upper plate body and the lower plate body, which are opposite, are respectively provided with a first mounting groove matched with the transmitting pipe body and a second mounting groove matched with the first receiving pipe body.
7. The smoke alarm with condensation identification function according to claim 1, wherein a plurality of air inlets are arranged, and the caliber is smaller than 1mm.
8. The smoke alarm with condensation identification function according to claim 1, wherein the housing comprises an upper housing cover and a lower housing which is tightly matched with the upper housing cover; the control board is fixedly arranged on one side surface of the upper shell cover, which faces the lower shell; the smoke detection bin is fixedly arranged on the lower surface of the control panel; the second smoke inlet is located at the lower end of the lower housing.
9. The smoke alarm with the condensation identification function according to claim 1, wherein a third mounting groove matched with the pin of the second receiving tube is formed in the side wall of the condensation identification bin; the third mounting groove is communicated with the outer surface of the condensation identification bin.
10. A method of using a smoke alarm based on any one of claims 1-9, comprising the steps of:
the transmitting tube transmits detection light;
acquiring a first reverse current value corresponding to the first receiving tube and a second reverse current value corresponding to the second receiving tube;
if the first receiving tube and the second receiving tube have no reverse current change, the control panel does not act; if the first receiving tube and the second receiving tube have reverse current change, and the difference value of the first reverse current value and the second reverse current value is not larger than a preset trigger threshold value, the control panel does not act; if the first receiving tube and the second receiving tube are provided with reverse current changes, and the difference value of the first reverse current value and the second reverse current value is larger than a preset trigger threshold value, the control panel outputs an alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010461860.0A CN111540158B (en) | 2020-05-27 | 2020-05-27 | Smoke alarm with condensation identification function and use method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010461860.0A CN111540158B (en) | 2020-05-27 | 2020-05-27 | Smoke alarm with condensation identification function and use method |
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| CN111540158A CN111540158A (en) | 2020-08-14 |
| CN111540158B true CN111540158B (en) | 2023-08-15 |
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| CN202010461860.0A Active CN111540158B (en) | 2020-05-27 | 2020-05-27 | Smoke alarm with condensation identification function and use method |
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| CN113643502A (en) * | 2021-07-23 | 2021-11-12 | 上海嘉筠通信技术有限公司 | Take TVOC to detect thing networking smoke alarm of function |
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| US7075445B2 (en) * | 2002-08-23 | 2006-07-11 | Ge Security, Inc. | Rapidly responding, false detection immune alarm signal producing smoke detector |
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| EP0418410A1 (en) * | 1989-09-19 | 1991-03-27 | Siemens Aktiengesellschaft | Method and device for compensating the air humidity in an optical smoke alarm |
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| CN111540158A (en) | 2020-08-14 |
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Address after: 518000 the three floor of the new world apartment, Nanshan Avenue, Nanshan District, Shenzhen, Guangdong (for office only). Applicant after: Shenzhen hi tech investment Sanjiang Electronics Co.,Ltd. Address before: 518000 the three floor of the new world apartment, Nanshan Avenue, Nanshan District, Shenzhen, Guangdong (for office only). Applicant before: SHENZHEN FANHAI SANJIANG ELECTRONICS Co.,Ltd. |
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