CN112347525B - Multi-way password protection device for mobile learning smart phone - Google Patents
Multi-way password protection device for mobile learning smart phone Download PDFInfo
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- CN112347525B CN112347525B CN202011223254.1A CN202011223254A CN112347525B CN 112347525 B CN112347525 B CN 112347525B CN 202011223254 A CN202011223254 A CN 202011223254A CN 112347525 B CN112347525 B CN 112347525B
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- smart phone
- supporting seat
- protective cover
- tube
- supporting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/04—Supports for telephone transmitters or receivers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/82—Protecting input, output or interconnection devices
Abstract
The invention relates to a multi-path password protection device for a mobile learning smart phone, which comprises a base, a folding supporting tube, a supporting seat and a protective cover, wherein the supporting seat is installed at the top of the base through the folding supporting tube, the protective cover is rotatably installed at the top of the supporting seat, a control box is installed on the outer side of the protective cover, side boxes are installed on two sides of the outer portion of the supporting seat, a wire groove is formed in the bottom side of the supporting seat, movable clamping seats are installed on two sides of the outer portion of the supporting seat, and one end of each movable clamping seat is slidably installed in the side box; can fix the smart mobile phone of difference inside installing, and fix the smart mobile phone, can supply the student to use the study at the study time, and carry out password protection state automatically after the study finishes, avoid the student to use to play, can guarantee under the condition of unmanned guardianship that the student accomplishes the study.
Description
Technical Field
The invention relates to the technical field of smart phones, in particular to a multi-path password protection device for a mobile learning smart phone.
Background
Smart phones are collective terms for those phones having stronger computing power and functions than those of conventional functional phones, and application fields are becoming wider and wider with the popularity of smart phones, in which mobile learning of web lessons is completed through smart phones.
When the student uses the smart mobile phone to carry out the in-process of online study, after the net class, partial student's self-control power is relatively poor, watches the video and plays the recreation through the smart mobile phone, and then influences student's study state, consequently when carrying out the study of net class through the ability cell-phone, needs the head of a family's nurse, and the head of a family is bound to this kind of study mode.
Disclosure of Invention
The invention aims to provide a multi-path password protection device for a mobile learning smart phone, which solves the technical problem that when students use the smart phone to learn on the internet, after an internet course is finished, the self-control ability of part of the students is poor, the learning state of the students is influenced by watching videos and playing games through the smart phone, and therefore parents need to be nursed when the students can learn the internet course through the smart phone, and the learning mode restrains the parents.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-path password protection device for a mobile learning smart phone comprises a base, a folding supporting tube, a supporting seat and a protective cover, wherein the supporting seat is installed at the top of the base through the folding supporting tube, the protective cover is rotatably installed at the top of the supporting seat, and a control box is installed on the outer side of the protective cover;
side boxes are arranged on two sides of the outer portion of the supporting seat, a wire groove is formed in the bottom side of the supporting seat, movable clamping seats are arranged on two sides of the outer portion of the supporting seat, and one end of each movable clamping seat is slidably arranged in each side box;
the miniature air pump is installed in the supporting seat outside, the supporting seat outside just is located miniature air pump top and bottom and runs through and installs fixed outer tube, the inside slidable mounting of fixed outer tube has hollow slider, and is provided with the sealing washer in the slider outside, movable inner tube is installed to slider one side, and the activity inner tube is located the fixed outer tube outside and installs the sucking disc, activity inner tube outside cover is equipped with the second spring, two the activity inner tube is connected with the connecting rod both ends respectively, the top press the depression bar is installed at activity inner tube top.
Preferably, the base is internally provided with a storage battery, and one side of the base is provided with a jack.
Preferably, control box internally mounted has the PLC controller, timer, trick lock and display screen are installed to the control box outside, and timer, trick lock and display screen all with PLC controller electric connection.
Preferably, the supporting blocks are installed on two sides of the top of the supporting seat, the servo motor is installed on the outer side of the supporting block at one end, the rotating rod is installed at the output end of the servo motor, and the rotating rod is fixedly connected with one end of the top of the protective cover.
Preferably, both sides the hypotenuse has been seted up at activity holder other end top, and the interval of both sides hypotenuse diminishes from the top to the bottom gradually, both sides the mounting groove has been seted up to the activity holder other end, the inside horizontal installation of mounting groove has a plurality of gyro wheel.
Preferably, a plurality of guide holes are formed in one end of the movable clamping seat, a plurality of guide rods are installed on one side inside the side box, one ends of the guide rods are slidably installed in the guide holes, and a plurality of first springs are sleeved on the outer sides of the guide rods.
Preferably, the outer end of the fixed outer tube is provided with a control valve, and the control valve is connected with the micro air pump through a connecting tube.
Preferably, the specific operation steps of the multi-path password protection device are as follows:
the method comprises the following steps: inputting a password through a password lock, driving a rotating rod to rotate by a servo motor on a supporting block at the moment, further driving a protective cover to rotate to the top of a supporting seat, driving a movable inner tube connected with a connecting rod to enter a fixed outer tube by pressing a pressing rod at the moment, compressing a second spring, vertically inserting the smart phone between two movable clamping seats, moving a roller on a mounting groove along the inclined surface of each movable clamping seat downwards, pressing the movable clamping seats into side boxes respectively, moving a guide hole of each movable clamping seat along a guide rod, compressing a first spring, clamping the smart phone between the two movable clamping seats through elastic deformation of the first spring when the bottom of the smart phone is in contact with the bottom side of the supporting seat, releasing the pressing rod at the moment, recovering the original shape according to the second spring, and enabling a sucker to be tightly attached to the back of the smart phone;
step two: the air pump of the miniature air pump is operated to pump out air in the fixed outer pipe and the movable inner pipe, negative pressure generated in the sucker is adsorbed on the back face of the smart phone, the second spring is continuously restored to the original state during adsorption, the movable inner pipe extends out of the fixed outer pipe to guarantee that the sucker is always adsorbed on the smart phone, when the movable inner pipe moves in the fixed outer pipe, the sliding connection is guaranteed through the sliding block and the sealing ring, and after the fixation is finished, the protective cover rotates to the outer side of the supporting seat to protect the smart phone;
step three: the time set by the timer is matched with the learning time, when the learning time is up, the protective cover rotates to expose the smart phone for the learner to use, the folding support tube is convenient for bending and folding to adjust the placement position of the smart phone, and when the learning time is up, the protective cover rotates to shield the smart phone and forbid the user to continue using;
step four: when the smart phone is forbidden, the smart phone is not closed, the exposed part below the protective cover is convenient for closing the smart phone, after the smart phone grows back, a password is input through the password lock, the protective cover is opened, the miniature air pump performs stamping, and then the smart phone is taken down.
The invention has the beneficial effects that: inputting a password through a password lock, driving a rotating rod to rotate by a servo motor on a supporting block, further driving a protective cover to rotate to the top of a supporting seat, driving a movable inner tube connected with a connecting rod to enter a fixed outer tube by pressing a pressing rod, compressing a second spring, vertically inserting the smart phone between two movable clamping seats, moving a roller on a mounting groove along the inclined surface of the movable clamping seat downwards, respectively pressing the movable clamping seats into a side box, moving a guide hole of the movable clamping seat along a guide rod, compressing a first spring, clamping the smart phone between the two movable clamping seats through elastic deformation of the first spring when the bottom of the smart phone is contacted with the bottom side of the supporting seat, releasing the pressing rod, recovering the original shape according to the second spring, attaching a sucking disc to the back of the smart phone, pumping air in the fixed outer tube and the movable inner tube by a micro air pump, and generating negative pressure inside the sucking disc to be adsorbed on the back of the smart phone, when the intelligent mobile phone is adsorbed, the second spring is continuously restored, the movable inner tube extends out of the fixed outer tube to ensure that the sucker is always adsorbed with the intelligent mobile phone, when the movable inner tube moves in the fixed outer tube, the sliding connection is ensured through the sliding block and the sealing ring, after the fixation is finished, the protective cover rotates to the outer side of the supporting seat to protect the intelligent mobile phone, the time set by the timer is matched with the learning time, when the learning time is reached, the protective cover rotates to expose the intelligent mobile phone for the learner to use, the folding supporting tube is convenient for bending and folding to adjust the placing position of the intelligent mobile phone, when the learning time is reached, the protective cover rotates to shield the intelligent mobile phone and forbid the continuous use, different intelligent mobile phones can be fixed in the device, the intelligent mobile phone is fixed, students can use and learn during the learning time, and the password protection state is automatically carried out after the learning is finished, the student is prevented from playing, and the student can be guaranteed to finish learning under the condition of no monitoring.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of a supporting seat mounting structure according to the present invention;
FIG. 3 is a cross-sectional view of the side box and removable cartridge of the present invention;
FIG. 4 is an overall back view of the present invention;
fig. 5 is a schematic view of the movable inner pipe installation structure of the invention.
Illustration of the drawings:
1. a base; 2. folding the supporting tube; 3. a supporting seat; 4. a protective cover; 5. a control box; 6. a wire slot; 7. a side box; 8. a movable clamp seat; 9. a roller; 10. mounting grooves; 11. a guide bar; 12. a first spring; 13. a guide hole; 14. a support block; 15. a servo motor; 16. a rotating rod; 17. a micro air pump; 18. fixing the outer tube; 19. a movable inner tube; 20. a slider; 21. a seal ring; 22. a suction cup; 23. a connecting rod; 24. a second spring; 25. a pressing lever; 101. and (4) inserting the jack.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Specific examples are given below.
Referring to fig. 1 to 5, the multi-path password protection device for the mobile learning smart phone comprises a base 1, a folding supporting tube 2, a supporting seat 3 and a protective cover 4, wherein the supporting seat 3 is installed at the top of the base 1 through the folding supporting tube 2, the protective cover 4 is rotatably installed at the top of the supporting seat 3, and a control box 5 is installed outside the protective cover 4;
side boxes 7 are arranged on two outer sides of the supporting seat 3, a wire slot 6 is formed in the bottom side of the supporting seat 3, movable clamping seats 8 are arranged on two outer sides of the supporting seat 3, and one end of each movable clamping seat 8 is slidably arranged in each side box 7;
As an embodiment of the invention, a storage battery is arranged in the base 1 to provide electric quantity support for the work of the device, and a jack 101 is arranged on one side of the base 1 to facilitate the plug-in connection with an external power supply.
A PLC controller is installed inside the control box 5, a timer of the type STM32F7, a coded lock of the type JYX-J9800 and a display screen are installed on the outer side of the control box 5, and the timer, the coded lock and the display screen are all electrically connected with the PLC controller of the type FX-20MR20 MT.
As an embodiment of the invention, supporting blocks 14 are respectively installed on two sides of the top of the supporting seat 3, a servo motor 15 is installed outside the supporting block 14 at one end, a rotating rod 16 is installed at the output end of the servo motor 15, the rotating rod 16 is fixedly connected with one end of the top of the protective cover 4, and the servo motor 15 on the supporting block 14 works to drive the rotating rod 16 to rotate.
As an embodiment of the present invention, the top of the other end of each of the two movable holders 8 is provided with a bevel edge, the distance between the bevel edges of the two sides gradually decreases from the top to the bottom, the other end of each of the two movable holders 8 is provided with a mounting groove 10, a plurality of rollers 9 are horizontally mounted inside the mounting groove 10, the smartphone is vertically inserted between the two movable holders 8, the rollers 9 on the mounting groove 10 along the bevel of each of the movable holders 8 move downward, the movable holders 8 are respectively pressed into the side boxes 7, and the guide hole 13 of each of the movable holders 8 moves along the guide rod 11.
As an embodiment of the present invention, one end of the movable clamping seat 8 is provided with a plurality of guide holes 13, one side of the inside of the side box 7 is provided with a plurality of guide rods 11, one end of each guide rod 11 is slidably installed in the guide hole 13, the outer sides of the plurality of guide rods 11 are respectively sleeved with a first spring 12, and the elastic deformation of the first spring 12 drives the movable clamping seat 8 to move, so as to clamp and fix different smart phones.
As an embodiment of the invention, a control valve is installed at the outer end of the fixed outer tube 18 and is connected with the micro air pump 17 through a connecting tube, and the air pressure inside the suction cup 22 is controlled through the micro air pump 17, so that the suction cup 22 is assembled and disassembled with the smart phone.
As an embodiment of the invention, the specific operation steps of the multi-path password protection device are as follows:
the method comprises the following steps: inputting a password through a password lock, driving a rotating rod 16 to rotate by working a servo motor 15 on a supporting block 14 at the moment, further driving a protective cover 4 to rotate to the top of a supporting seat 3, driving a movable inner tube 19 connected with a connecting rod 23 to enter a fixed outer tube 18 by pressing a pressing rod 25 at the moment, compressing a second spring 24, vertically inserting the smart phone between two movable clamping seats 8, moving a roller 9 on a mounting groove 10 along the inclined surface of the movable clamping seat 8 downwards, respectively pressing the movable clamping seats 8 into a side box 7, moving a guide hole 13 of the movable clamping seat 8 along a guide rod 11, compressing a first spring 12, clamping the smart phone between the two movable clamping seats 8 through elastic deformation of the first spring 12 when the bottom of the smart phone is contacted with the bottom side of the supporting seat 3, releasing the pressing rod 25 at the moment, recovering the original shape according to the second spring 24, and enabling a sucker 22 to be tightly attached to the back of the smart phone;
step two: the air pump 17 works to pump out air in the fixed outer tube 18 and the movable inner tube 19, negative pressure generated inside the suction cup 22 is adsorbed on the back face of the smart phone, the second spring 24 is continuously restored during adsorption, the movable inner tube 19 extends out of the fixed outer tube 18, the suction cup 22 is ensured to be adsorbed on the smart phone all the time, when the movable inner tube 19 moves in the fixed outer tube 18, the sliding connection is ensured to be sealed through the sliding block 20 and the sealing ring 21, and after the fixation is completed, the protective cover 4 rotates to the outer side of the supporting seat 3 to protect the smart phone;
step three: the time set by the timer is matched with the learning time, when the learning time is up, the protective cover 4 rotates to expose the smart phone for the learner to use, the folding support tube 2 is convenient for bending and folding to adjust the placement position of the smart phone, and when the learning time is up, the protective cover 4 rotates to shield the smart phone and forbid the user to continue using;
step four: when the smart phone is forbidden, the smart phone is not closed, the exposed part below the protective cover 4 is convenient for closing the smart phone, after the smart phone is grown back, a password is input through a password lock, the protective cover 4 is opened, the miniature air pump 17 is punched, and then the smart phone is taken down.
The working principle is as follows: inputting a password through a password lock, at the moment, a servo motor 15 on a supporting block 14 works to drive a rotating rod 16 to rotate, and further drives a protective cover 4 to rotate to the top of a supporting seat 3, at the moment, a pressing rod 25 is pressed to drive a movable inner tube 19 connected with a connecting rod 23 to enter a fixed outer tube 18, and a second spring 24 is compressed, a smart phone is vertically inserted between two movable clamping seats 8, a roller 9 on a mounting groove 10 along the inclined surface of the movable clamping seat 8 moves downwards, the movable clamping seats 8 are respectively pressed into a side box 7, a guide hole 13 of the movable clamping seat 8 moves along a guide rod 11, and a first spring 12 is compressed, when the bottom of the smart phone is contacted with the bottom side of the supporting seat 3, the smart phone is clamped between the two movable clamping seats 8 through the elastic deformation of the first spring 12, at the moment, the pressing rod 25 is released, the original state is restored according to the second spring 24, a sucker 22 is tightly attached to the back of the smart phone, and an air pump 17 works to pump out air in the fixed outer tube 18 and the movable inner tube 19, at the moment, negative pressure generated inside the suction cup 22 is absorbed on the back of the smart phone, when the negative pressure is absorbed, the second spring 24 is continuously restored to the original state, the movable inner tube 19 extends out of the fixed outer tube 18, the suction cup 22 is ensured to be absorbed with the smart phone all the time, when the movable inner tube 19 moves in the fixed outer tube 18, the sliding connection is ensured through the sliding block 20 and the sealing ring 21, after the fixation is finished, the protective cover 4 rotates to the outer side of the supporting seat 3 to protect the smart phone, the time set by the timer is matched with the learning time, when the learning time is reached, the protective cover 4 rotates to expose the smart phone for the learner to use, the folding supporting tube 2 is convenient for bending and folding to adjust the placement position of the smart phone, when the learning time is reached, the protective cover 4 rotates to shield the smart phone, the continuous use is forbidden, different smart phones can be fixed in the device, and the smart phones are fixed, can supply the student to use the study at the study time, and carry out password protection state automatically after the study, avoid the student to use and play, can guarantee under the unmanned circumstances of guardianship that the student accomplishes the study.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A multi-path password protection device for a mobile learning smart phone is characterized by comprising a base (1), a folding supporting tube (2), a supporting seat (3) and a protective cover (4), wherein the supporting seat (3) is installed at the top of the base (1) through the folding supporting tube (2), the protective cover (4) is rotatably installed at the top of the supporting seat (3), and a control box (5) is installed on the outer side of the protective cover (4);
side boxes (7) are respectively mounted on two outer sides of the supporting seat (3), a wire slot (6) is formed in the bottom side of the supporting seat (3), movable clamping seats (8) are respectively mounted on two outer sides of the supporting seat (3), and one end of each movable clamping seat (8) is slidably mounted in each side box (7);
a micro air pump (17) is installed on the outer side of the supporting seat (3), a fixed outer tube (18) is installed on the outer side of the supporting seat (3) and located at the top and the bottom of the micro air pump (17) in a penetrating mode, a hollow sliding block (20) is installed inside the fixed outer tube (18) in a sliding mode, a sealing ring (21) is arranged on the outer side of the sliding block (20), a movable inner tube (19) is installed on one side of the sliding block (20), a sucking disc (22) is installed on the outer side of the fixed outer tube (18) of the movable inner tube (19), a second spring (24) is sleeved on the outer side of the movable inner tube (19), the two movable inner tubes (19) are connected with two ends of a connecting rod (23) respectively, and a pressing rod (25) is installed on the top of the movable inner tube (19);
the specific operation steps of the multi-path password protection device are as follows:
the method comprises the following steps: the password is input through the password lock, the servo motor (15) on the supporting block (14) works to drive the rotating rod (16) to rotate at the moment, the protective cover (4) is further driven to rotate to the top of the supporting seat (3), the movable inner tube (19) connected with the connecting rod (23) is driven to enter the fixed outer tube (18) by pressing the pressing rod (25) at the moment, the second spring (24) is compressed, the smart phone is vertically inserted between the two movable clamping seats (8), the roller (9) on the installation groove (10) along the inclined surface of the movable clamping seat (8) moves downwards, the movable clamping seats (8) are respectively pressed into the side boxes (7), the guide hole (13) of the movable clamping seat (8) moves along the guide rod (11) and compresses the first spring (12), when the bottom of the smart phone is in contact with the bottom side of the supporting seat (3), the smart phone is clamped between the two movable clamping seats (8) through the elastic deformation of the first spring (12), at the moment, the pressing rod (25) is released, the second spring (24) is pressed to restore the original state, and the sucking disc (22) is tightly attached to the back surface of the smart phone;
step two: the air pump of the miniature air pump (17) works to pump out air in the fixed outer tube (18) and the movable inner tube (19), negative pressure generated inside the sucker (22) is adsorbed on the back of the smart phone at the moment, the second spring (24) is continuously restored to the original state during adsorption, the movable inner tube (19) extends out of the fixed outer tube (18), the sucker (22) is guaranteed to be adsorbed with the smart phone all the time, when the movable inner tube (19) moves in the fixed outer tube (18), sealing sliding connection is guaranteed through the slider (20) and the sealing ring (21), and after fixation is completed, the protective cover (4) rotates to the outer side of the supporting seat (3) to protect the smart phone;
step three: the time set by the timer is matched with the learning time, when the learning time is up, the protective cover (4) rotates to expose the smart phone for the learner to use, the folding support tube (2) is convenient for bending and folding to adjust the placement position of the smart phone, and when the learning time is up, the protective cover (4) rotates to shield the smart phone and forbid the user to continue using;
step four: when the smart phone is forbidden, the smart phone is not closed, the exposed part below the protective cover (4) is convenient to close the smart phone, after the smart phone is grown back, a password is input through the password lock, the protective cover (4) is opened, the miniature air pump (17) is punched, and then the smart phone is taken down.
2. The multi-path password protection device for the mobile learning smart phone according to claim 1, wherein a storage battery is installed inside the base (1), and a jack (101) is formed in one side of the base (1).
3. The multi-path password protection device for the mobile learning smart phone according to claim 1, wherein a PLC (programmable logic controller) is installed inside the control box (5), a timer, a password lock and a display screen are installed outside the control box (5), and the timer, the password lock and the display screen are electrically connected with the PLC.
4. The multi-path password protection device for the mobile learning smart phone of claim 1, wherein supporting blocks (14) are installed on two sides of the top of the supporting base (3), a servo motor (15) is installed outside the supporting blocks (14) at one end, a rotating rod (16) is installed at the output end of the servo motor (15), and the rotating rod (16) is fixedly connected with one end of the top of the protective cover (4).
5. The multi-path password protection device for the mobile learning smart phone according to claim 1, wherein the top of the other end of the movable clamping seat (8) at two sides is provided with a bevel edge, the distance between the bevel edges at two sides is gradually reduced from the top to the bottom, the other end of the movable clamping seat (8) at two sides is provided with a mounting groove (10), and a plurality of rollers (9) are horizontally mounted inside the mounting groove (10).
6. The multi-path password protection device for the mobile learning smart phone according to claim 1, wherein a plurality of guide holes (13) are formed in one end of the movable holder (8), a plurality of guide rods (11) are installed on one side of the inside of the side box (7), one ends of the guide rods (11) are slidably installed in the guide holes (13), and first springs (12) are sleeved on the outer sides of the plurality of guide rods (11).
7. The multi-path password protection device for the mobile learning smart phone as claimed in claim 1, wherein the outer end of the fixed outer tube (18) is provided with a control valve, and the control valve is connected with the micro air pump (17) through a connecting tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011223254.1A CN112347525B (en) | 2020-11-05 | 2020-11-05 | Multi-way password protection device for mobile learning smart phone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011223254.1A CN112347525B (en) | 2020-11-05 | 2020-11-05 | Multi-way password protection device for mobile learning smart phone |
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| Publication Number | Publication Date |
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| CN112347525A CN112347525A (en) | 2021-02-09 |
| CN112347525B true CN112347525B (en) | 2022-05-31 |
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| CN202011223254.1A Active CN112347525B (en) | 2020-11-05 | 2020-11-05 | Multi-way password protection device for mobile learning smart phone |
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| CN206918588U (en) * | 2017-04-05 | 2018-01-23 | 赵红革 | A kind of notebook computer bracket for being easy to student to operate |
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| CN105723691A (en) * | 2013-10-17 | 2016-06-29 | 弗朗茨·维特 | Holder for a mobile telecommunications terminal |
| KR20170044471A (en) * | 2015-10-15 | 2017-04-25 | 삼성전자주식회사 | A METHOD FOR LOCKING AND UNLOCKING OF A MOBILE DEVICE WITH A TOUCH SCRREN, and MOBILE DEVICE |
| CN205320130U (en) * | 2015-11-18 | 2016-06-15 | 何淑芳 | Mobile phone bracket |
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| Publication number | Publication date |
|---|---|
| CN112347525A (en) | 2021-02-09 |
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