CN110166869B - Bluetooth headset pairing device and pairing method - Google Patents
Bluetooth headset pairing device and pairing method Download PDFInfo
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- CN110166869B CN110166869B CN201910463131.6A CN201910463131A CN110166869B CN 110166869 B CN110166869 B CN 110166869B CN 201910463131 A CN201910463131 A CN 201910463131A CN 110166869 B CN110166869 B CN 110166869B
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- circuit
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- bluetooth headset
- resistor
- control circuit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1041—Mechanical or electronic switches, or control elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
Abstract
The invention provides a Bluetooth headset pairing device.A control mainboard comprises a control circuit, a power circuit and a reset circuit; the power circuit is used for supplying power to the Bluetooth headset pairing device; the reset circuit is electrically connected with the control circuit; the base plate comprises a communication circuit and a plurality of connecting circuits, wherein the communication circuit is connected to the communication interface of the control circuit; the connecting circuit is used for connecting a Bluetooth headset, and the input end of the connecting circuit is connected with the output end of the control circuit; the output end of the control circuit controls the connecting circuit to output high level or low level. The device has promoted the efficiency of ears bluetooth headset pairing operation before dispatching from the factory, and a multimachine need not artifical the affirmation, improves the rate of accuracy, and the save time manpower easily improves and produces line productivity ratio.
Description
Technical Field
The invention belongs to the technical field of production, and particularly relates to a Bluetooth headset pairing device and a Bluetooth headset pairing method.
Background
The tool mainly comprises a control main board and an earphone base board, wherein the control main board and the earphone base board are communicated through a serial port, a main button is arranged on the main board, when the tool is used, after the Bluetooth earphone is started, two ears are placed on an ejector pin of the earphone base board to be connected, the main board presses down a key of the main board, the main board automatically controls to send a set pairing instruction to the two ears, so that the two ears enter a left ear pairing mode and a right ear pairing mode, pairing results are automatically detected, if the pairing is successful, an L ED lamp on an IO level point bottom base board is pulled up, and the successful pairing is prompted.
The product is convenient to operate, but only one pair of earphones can be paired at a time, and the earphone needs to be manually started and then put into operation each time, so that time is consumed, and the pairing failure caused by the fact that the earphones are not normally started when being connected is difficult to detect. Bluetooth earphones generally have a dormant power-off state on the world, and automatic power-off of the earphones due to overtime operation is easy to cause pairing failure. Compared with the traditional manual control of binaural pairing, the efficiency of using the product is not improved too much, and the error rate still has a large rate.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the Bluetooth headset pairing device and the Bluetooth headset pairing method, which improve the efficiency of pairing operation of the double-ear Bluetooth headset before leaving factory, realize one-time multi-machine pairing without manual confirmation, improve the accuracy, save time and labor and easily improve the production line productivity.
In a first aspect, a bluetooth headset pairing apparatus includes: the main control board and the base board are controlled;
the control main board comprises a control circuit, a power circuit and a reset circuit; the power circuit is used for supplying power to the Bluetooth headset pairing device; the reset circuit is electrically connected with the control circuit;
the base plate comprises a communication circuit and a plurality of connecting circuits, wherein the communication circuit is connected to the communication interface of the control circuit; the connecting circuit is used for connecting a Bluetooth headset, and the input end of the connecting circuit is connected with the output end of the control circuit; the output end of the control circuit controls the connecting circuit to output high level or low level.
Preferably, the power supply circuit is used for converting 5V voltage into 3.3V voltage through a voltage regulator V1;
the reset circuit comprises a key S4, a capacitor C10, a resistor R59 and a resistor R58; the key S4 is connected in parallel with the capacitor C10, a common node of the key S4 and the capacitor C10 is grounded, the other common node of the key S4 and the capacitor C10 is connected with 3.3V voltage through the resistor R58, and the common node of the resistor R58 and the capacitor C10 is connected to the reset end of the control circuit.
Preferably, the control mainboard further comprises L ED circuits and key circuits;
the L ED circuit comprises a first L ED lamp and a plurality of second L ED lamps, wherein the first L ED lamp is grounded at one end and is connected to a positive voltage at the other end through a resistor R51, all the second L ED lamps are connected in parallel, wherein the second L ED lamp is connected to the control circuit at one end, and the second L ED lamp is connected to the positive voltage at the other end through the first resistor;
the key circuit comprises a plurality of keys, one end of each key is grounded, the other end of each key is connected to a positive voltage through a second resistor, and a common node of the second resistor and the keys is connected to the control circuit.
Preferably, the connection circuit comprises a PMOS transistor, a triode and a diode;
the drain electrode of the PMOS tube is connected with a positive voltage, the grid electrode of the PMOS tube is connected with the drain electrode of the PMOS tube through a third resistor, the source electrode of the PMOS tube is connected with the thimble, and the source electrode of the PMOS tube is connected with the drain electrode of the PMOS tube through the positive connection diode; the grid electrode of the PMOS tube is connected with the collector electrode of the triode, the base electrode of the triode is connected to the control circuit, and the emitting electrode of the triode is connected to the base electrode of the triode through the fourth resistor.
Preferably, the communication circuit of the base plate comprises a UART circuit and an I2And C circuit.
In a second aspect, a bluetooth headset pairing method includes the following steps:
when a pairing instruction input by a user is received, sequentially pairing the Bluetooth earphones plugged into the Bluetooth earphone pairing device of the first aspect;
wherein the pairing process for each bluetooth headset comprises:
closing the power supply of the current connecting circuit of the Bluetooth headset and stopping charging the Bluetooth headset;
when a starting signal of the Bluetooth headset is received after the set waiting time, sending a pairing instruction to a left headset and a right headset of the Bluetooth headset, and starting timing;
when a pairing success command returned by the Bluetooth headset is received before the preset timing time is reached, returning a pairing result containing successful pairing;
and when the preset timing time is up and the pairing success command returned by the Bluetooth headset is not received, returning a pairing result containing pairing failure.
Preferably, after completing the pairing process of each bluetooth headset, the method turns on the power supply of the connection circuit of the bluetooth headset to charge the bluetooth headset.
Preferably, the receiving of the pairing instruction is implemented by serial port interrupt, and specifically includes:
when receiving data input by a serial port, storing the data;
if the data is correct, defining the data as the pairing instruction;
if the data is erroneous, the data is discarded.
According to the technical scheme, the control circuit controls the connecting circuit on the base plate, so that the pairing function of the multi-binaural Bluetooth headset is completed, the efficiency of pairing operation of the binaural Bluetooth headset before delivery is improved, one-time multi-machine operation is realized, manual confirmation is not needed, the accuracy is improved, time and labor are saved, and the production line productivity is easily improved.
The Bluetooth headset pairing method provided by the invention solves the problem that in the prior art, one person and one machine are tedious, the efficiency of pairing operation before delivery of the Bluetooth headset is rapidly and effectively improved, the two machines are combined at one time, the accuracy is improved without manual confirmation, the time and the labor are saved, and the production line productivity is easily improved.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a block diagram of a bluetooth headset pairing apparatus according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a control chip according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a reset circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a power circuit according to an embodiment of the invention.
Fig. 5 is a circuit diagram of an L ED circuit according to an embodiment of the present invention.
Fig. 6 is a circuit diagram of a key circuit according to an embodiment of the present invention.
Fig. 7 is a circuit diagram of a connection circuit according to an embodiment of the invention.
Fig. 8 is a main processing flow of the control chip according to the second embodiment of the present invention.
Fig. 9 is a flow of pairing processing performed by the control chip according to the second embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby. It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
The first embodiment is as follows:
a bluetooth headset pairing apparatus, see fig. 1, comprising: the main control board and the base board are controlled;
the control main board comprises a control circuit, a power circuit and a reset circuit; the power circuit is used for supplying power to the Bluetooth headset pairing device; the reset circuit is electrically connected with the control circuit;
the base plate comprises a communication circuit and a plurality of connecting circuits, wherein the communication circuit is connected to the communication interface of the control circuit; the connecting circuit is used for connecting a Bluetooth headset, and the input end of the connecting circuit is connected with the output end of the control circuit; the output end of the control circuit controls the connecting circuit to output high level or low level.
Specifically, the control circuit includes a control chip, such as the control chip and the peripheral circuit shown in fig. 2. The device can provide a multi-split Bluetooth headset pairing function. For example, if a ten-by-ten bluetooth headset pairing function is required, ten connection circuits are provided. A connection circuit is used to enable pairing of a binaural bluetooth headset. The device realizes the control to connecting circuit on the bed plate by control circuit to accomplish many ears bluetooth headset's the function of pairing, promoted ears bluetooth headset and dispatched the factory before the efficiency of pairing operation, a multimachine need not artifical the affirmation, improves the rate of accuracy, and the production line productivity ratio is produced in the light improvement to the save time manpower.
Referring to fig. 3, the reset circuit includes a key S4, a capacitor C10, a resistor R59 and a resistor R58; the key S4 is connected in parallel with the capacitor C10, a common node of the key S4 and the capacitor C10 is grounded, the other common node of the key S4 and the capacitor C10 is connected with 3.3V voltage through the resistor R58, and the common node of the resistor R58 and the capacitor C10 is connected to the reset end of the control circuit.
Specifically, when the user presses the key S4, the reset terminal (NRST) of the control chip inputs a low level, so that the control chip is reset, and the bluetooth headset pairing device is reset.
Referring to fig. 4, the power supply circuit is used for converting 5V voltage into 3.3V voltage through a voltage regulator V1;
specifically, the power supply circuit in fig. 4 performs power supply conversion by using the voltage regulator V1, and can output a stable 3.3V voltage.
The control main board further comprises an L ED circuit and a key circuit;
referring to fig. 5, the L ED circuit includes a first L ED lamp and a plurality of second L ED lamps, wherein the first L ED lamp is connected to ground at one end and to a positive voltage at the other end through a resistor R51, all the second L ED lamps are connected in parallel, wherein the second L ED lamp is connected to the control circuit at one end and to a positive voltage at the other end through a first resistor;
the device indicates whether the pairing is successful or not by setting a plurality of second L ED lamps, for example, a plurality of second L ED lamps are set in FIG. 5, which can indicate whether the pairing of the current binaural Bluetooth headset is successful or failed.
Referring to fig. 6, the key circuit includes a plurality of keys, one end of each key is grounded, the other end of each key is connected to a positive voltage through a second resistor, and a common node of the second resistor and the key is connected to the control circuit.
In particular, the device is also provided with a plurality of keys for implementing different functions.
Referring to fig. 7 and 8, the connection circuit includes a PMOS transistor, a transistor, and a diode;
the drain electrode of the PMOS tube is connected with a positive voltage, the grid electrode of the PMOS tube is connected with the drain electrode of the PMOS tube through a third resistor, the source electrode of the PMOS tube is connected with the thimble, and the source electrode of the PMOS tube is connected with the drain electrode of the PMOS tube through the positive connection diode; the grid electrode of the PMOS tube is connected with the collector electrode of the triode, the base electrode of the triode is connected to the control circuit, and the emitting electrode of the triode is connected to the base electrode of the triode through the fourth resistor.
Specifically, during the use, the both ears are placed and are inserted on the thimble of earphone bed plate after the bluetooth headset starts the machine, and the 5V charging source of connecting circuit is opened entirely and is supplied power for the earphone of inserting, and the earphone charges and resets. When the earphone receives the pairing message through the communication circuit of the base plate and is to start pairing, 5V charging for the earphone is closed, and when the earphone is judged to be paired, the connecting circuit opens the 5V charging of the base of the current earphone.
Preferably, the communication circuit of the base plate comprises a UART circuit and an I2And C circuit.
The device controls and can set up 2 ways UART circuit on the mainboard for with the communication of left and right ear earphone on the bed plate, control the mainboard and can also provide multichannel controllable 5V power output and charge for bluetooth headset, act as bluetooth headset reset action, the L ED circuit and the keying circuit of the device can be external, also can display and pair the progress with external display screen.
Serial ports and GND can be further arranged on the base plate, and the 5V power supply for controlling the mainboard provides MOS control on the base plate. The left and right earphones of the base plate are connected to the two UARTs of the control mainboard in parallel, and because the output of the UART pins of the earphones in an idle state TX is high, the connecting diodes can avoid the influence of the high level of the Bluetooth earphones on communication. And the GND pins are connected in parallel in a multi-way mode. If the device is used to pair 10 pairs of bluetooth headsets simultaneously, each pair of bluetooth headsets requires 150mA of current, and a large current of 1.5A may be present in 10 paths. Control the mainboard and only need provide control signal, the high level lights the TX of bluetooth headset's UART and connects the diode, and the low level is effective, charges bluetooth headset, does not respond to the UART message in charging, and high level always, so the RX port of bluetooth headset's UART is the receipt, and a plurality of parallelly connected nothing is influenced to the communication.
Example two:
a Bluetooth headset pairing method comprises the following steps:
when a pairing instruction input by a user is received, sequentially pairing the Bluetooth earphones plugged into the Bluetooth earphone pairing device;
specifically, firstly, the workman pegs graft on the thimble of bed plate respectively with the ears about with many pairs of ears bluetooth headset according to, open and control the 5V power on the mainboard and charge all bluetooth headset, bluetooth headset automatic shutdown resets and gets into the mode of charging, dispose two second L ED lamps on every bed plate, normal condition this moment, red light (L ED1) light, instruct bluetooth headset normally to insert the base, the pairing result of every pair of bluetooth headset of demonstration that can clearly understand like this, saved the operation that the workman confirmed again, convenient and fast.
Wherein the pairing process for each bluetooth headset comprises:
closing the power supply of the current connecting circuit of the Bluetooth headset and stopping charging the Bluetooth headset;
when a starting signal of the Bluetooth headset is received after the set waiting time, sending a pairing instruction to a left headset and a right headset of the Bluetooth headset, and starting timing;
when a pairing success command returned by the Bluetooth headset is received before the preset timing time is reached, returning a pairing result containing successful pairing;
and when the preset timing time is up and the pairing success command returned by the Bluetooth headset is not received, returning a pairing result containing pairing failure.
Specifically, after a key of a main board is pressed (namely a pairing instruction is received), pairing is started from a first Bluetooth headset, 5V charging of the Bluetooth headset is closed, after one second, the Bluetooth headset is started, then the main board is controlled to automatically send pairing entering instructions to two headsets through a serial port respectively, the Bluetooth headset is waited for completing pairing, timing is carried out simultaneously, when a signal returned by the Bluetooth headset is successfully paired or the time is waited for overtime, the pairing result of the Bluetooth headset is obtained through overtime or a headset returning signal, if the pairing is completed, a 5V power supply of the current Bluetooth headset can be turned on, the Bluetooth headset enters a charging state, then the Bluetooth headset is switched to be paired with the next Bluetooth headset, when all the headset pairing is completed, the pairing result is prompted to be completed and displayed, a Bluetooth headset base which is successfully paired is bright green light (L ED2), if the pairing of the headset fails, the pairing of the next headset starts to be paired with an error headset until all ten pairs of the Bluetooth headsets are successfully paired.
The method solves the problem that in the prior art, one person has one machine and one machine has one machine at a time, the pairing operation efficiency of the Bluetooth earphones before leaving a factory is rapidly and effectively improved, the earphones are multiple machines at a time, the accuracy is improved without manual confirmation, the time and the labor are saved, and the production line production rate is easily improved.
Preferably, the receiving of the pairing instruction is implemented by serial port interrupt, and specifically includes:
when receiving data input by a serial port, storing the data;
if the data is correct, defining the data as the pairing instruction;
if the data is erroneous, the data is discarded.
Specifically, referring to fig. 9, when the control chip is started, peripheral initialization, timer management, interrupt initialization, and pairing frequency setting to 0 (indicating that pairing has not been started) may be performed. And when the control chip receives the correct pairing instruction, circularly executing the pairing process.
When pairing is carried out, according to three simple instructions of controlling pairing, connecting and confirming success, the Bluetooth earphones are controlled at one time to realize pairing, start TWS connection and confirm whether pairing results are successful or not, and display is carried out.
Preferably, after completing the pairing process of each bluetooth headset, the method turns on the power supply of the connection circuit of the bluetooth headset to charge the bluetooth headset.
For the sake of brief description, the method provided by the embodiment of the present invention may refer to the corresponding contents in the foregoing device embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. A bluetooth headset pairing apparatus, comprising: the main control board and the base board are controlled;
the control main board comprises a control circuit, a power circuit and a reset circuit; the power circuit is used for supplying power to the Bluetooth headset pairing device; the reset circuit is electrically connected with the control circuit;
the base plate comprises a communication circuit and a plurality of connecting circuits, wherein the communication circuit is connected to the communication interface of the control circuit; the connecting circuit is used for connecting a Bluetooth headset, and the input end of the connecting circuit is connected with the output end of the control circuit; the output end of the control circuit controls the connecting circuit to output high level or low level;
the connecting circuit comprises a PMOS tube, a triode and a diode;
the drain electrode of the PMOS tube is connected with a positive voltage, the grid electrode of the PMOS tube is connected with the drain electrode of the PMOS tube through a third resistor, the source electrode of the PMOS tube is connected with the thimble, and the source electrode of the PMOS tube is connected with the drain electrode of the PMOS tube through the positive connection diode; the grid electrode of the PMOS tube is connected with the collector electrode of the triode, the base electrode of the triode is connected to the control circuit, and the emitting electrode of the triode is connected to the base electrode of the triode through the fourth resistor.
2. The Bluetooth headset pairing apparatus of claim 1,
the power supply circuit is used for converting 5V voltage into 3.3V voltage through a voltage stabilizer V1;
the reset circuit comprises a key S4, a capacitor C10, a resistor R59 and a resistor R58; the key S4 is connected in parallel with the capacitor C10, a common node of the key S4 and the capacitor C10 is grounded, the other common node of the key S4 and the capacitor C10 is connected with 3.3V voltage through the resistor R58, and the common node of the resistor R58 and the capacitor C10 is connected to the reset end of the control circuit.
3. The Bluetooth headset pairing apparatus of claim 1,
the control main board further comprises an L ED circuit and a key circuit;
the L ED circuit comprises a first L ED lamp and a plurality of second L ED lamps, wherein the first L ED lamp is grounded at one end and is connected to a positive voltage at the other end through a resistor R51, all the second L ED lamps are connected in parallel, wherein the second L ED lamp is connected to the control circuit at one end, and the second L ED lamp is connected to the positive voltage at the other end through the first resistor;
the key circuit comprises a plurality of keys, one end of each key is grounded, the other end of each key is connected to a positive voltage through a second resistor, and a common node of the second resistor and the keys is connected to the control circuit.
4. The Bluetooth headset pairing apparatus of claim 1,
the communication circuit of the base plate comprises a UART circuit and an I2And C circuit.
5. A Bluetooth headset pairing method is characterized by comprising the following steps:
when a pairing instruction input by a user is received, sequentially pairing the Bluetooth earphones plugged in the Bluetooth earphone pairing device of any one of claims 1-4;
wherein the pairing process for each bluetooth headset comprises:
closing the power supply of the current connecting circuit of the Bluetooth headset and stopping charging the Bluetooth headset;
when a starting signal of the Bluetooth headset is received after the set waiting time, sending a pairing instruction to a left headset and a right headset of the Bluetooth headset, and starting timing;
when a pairing success command returned by the Bluetooth headset is received before the preset timing time is reached, returning a pairing result containing successful pairing;
and when the preset timing time is up and the pairing success command returned by the Bluetooth headset is not received, returning a pairing result containing pairing failure.
6. The Bluetooth headset pairing method of claim 5,
after the pairing process of each Bluetooth headset is completed, the method turns on the power supply of the connecting circuit of the Bluetooth headset to charge the Bluetooth headset.
7. The Bluetooth headset pairing method of claim 5,
the receiving of the pairing instruction is realized through serial port interruption, and specifically comprises the following steps:
when receiving data input by a serial port, storing the data;
if the data is correct, defining the data as the pairing instruction;
if the data is erroneous, the data is discarded.
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| CN110474403A (en) * | 2019-09-23 | 2019-11-19 | 深圳市安特信技术有限公司 | A kind of charging base and implementation method for being communicated with bluetooth headset |
| CN111031438A (en) * | 2019-12-27 | 2020-04-17 | 深圳春沐源控股有限公司 | Control method of earphone assembly, earphone assembly and computer readable storage medium |
| CN116321096B (en) * | 2023-05-24 | 2023-08-11 | 深圳市拓普泰克技术股份有限公司 | Automatic pairing method, device and equipment for wireless products |
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| EP3153056A1 (en) * | 2015-09-30 | 2017-04-12 | Apple Inc. | Case with magnetic over-center mechanism |
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| CN103323767B (en) * | 2013-06-25 | 2015-11-18 | 福州瑞芯微电子股份有限公司 | A kind of method and system thereof of testing bluetooth module on embedded PCB A |
| CN207588496U (en) * | 2017-11-27 | 2018-07-06 | 中山市天键电声有限公司 | A kind of charging bluetooth earphone device |
| CN108174457B (en) * | 2018-01-12 | 2020-09-01 | 恒玄科技(上海)股份有限公司 | Charging box, communication system and communication method of Bluetooth headset |
| CN109348466A (en) * | 2018-11-29 | 2019-02-15 | 与德科技有限公司 | Bluetooth headset, bluetooth headset box and bluetooth headset MAC Address exchange method |
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| EP3153056A1 (en) * | 2015-09-30 | 2017-04-12 | Apple Inc. | Case with magnetic over-center mechanism |
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