Electronic device

Abstract

The application discloses an electronic device, and belongs to the technical field of communication. The electronic device comprises a shell, a key and a key circuit. The key is arranged on the shell, and a grounding end is arranged on the key. The grounding end is electrically connected with the key circuit, and is used for grounding of the key circuit. The electronic device further comprises a frequency modulation circuit. The frequency modulation circuit is arranged in the shell, and is electrically connected with the grounding end. When the electronic device is in a frequency modulation mode, the frequency modulation circuit receives a frequency modulation signal through the grounding end.

Description

Technical Field

[0001] This application belongs to the field of communication technology, and specifically relates to an electronic device. Background Technology

[0002] Electronic devices typically use 3.5-inch headphone cables as frequency modulation (FM) antennas to enable FM functionality. However, with the increasing sophistication of electronic devices, data cable interfaces, including headphone jacks, are increasingly being converted to Type-C. Since Type-C interfaces do not have a pre-installed FM antenna, there is no connection point for the FM antenna, thus preventing the FM function from being implemented.

[0003] How to implement FM functionality on electronic devices without a pre-installed FM antenna is a technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of this application is to provide an electronic device that can implement frequency modulation function on an electronic device without a reserved FM antenna.

[0005] In a first aspect, embodiments of this application provide an electronic device, including a housing, a button, and a button circuit; the button is disposed on the housing, and a ground terminal is provided on the button, the ground terminal being electrically connected to the button circuit for grounding the button circuit; the electronic device further includes a frequency modulation circuit disposed within the housing, the frequency modulation circuit being electrically connected to the ground terminal; when the electronic device is in frequency modulation mode, the frequency modulation circuit receives a frequency modulation signal through the ground terminal.

[0006] In this embodiment, by setting a frequency modulation circuit inside the housing of the electronic device and electrically connecting it to the grounding terminal of the button circuit of the electronic device, when the electronic device is in frequency modulation mode, the frequency modulation circuit receives the frequency modulation signal through the grounding terminal. Thus, the frequency modulation circuit can directly reuse the trace of the grounding terminal as an FM antenna and integrate it with the button circuit. The FM function of the electronic device can be directly realized on electronic devices without a reserved FM antenna, without relying on external accessory interface cables such as headphone cables. This reduces the cost of the electronic device and avoids other signal interference and FM signal attenuation, achieving better frequency modulation performance. Attached Figure Description

[0007] Figure 1 This is a structural block diagram of an electronic device according to an embodiment of this application.

[0008] Figure 2 This is a schematic diagram of the circuit structure of the frequency modulation antenna circuit according to an embodiment of this application.

[0009] Figure 3This is a schematic diagram of the circuit structure of the amplification and filtering module according to an embodiment of this application.

[0010] Figure 4 This is a schematic diagram of the circuit structure of the button circuit according to an embodiment of this application.

[0011] Figure 5 This is a schematic diagram of the communication wiring of the button circuit according to an embodiment of this application. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0013] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0014] The electronic device provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0015] In one embodiment of this application, an electronic device is provided, including a housing, a button, and a button circuit; the button is disposed on the housing, and a ground terminal is provided on the button, the ground terminal being electrically connected to the button circuit for grounding the button circuit; the electronic device further includes a frequency modulation circuit disposed inside the housing, the frequency modulation circuit being electrically connected to the ground terminal; when the electronic device is in frequency modulation mode, the frequency modulation circuit receives a frequency modulation signal through the ground terminal.

[0016] like Figure 1 As shown, the electronic device of this application embodiment includes a button circuit 10 and a frequency modulation circuit 20. A button is provided on the housing of the electronic device, and the button has a ground terminal 30 electrically connected to the button circuit 10. The frequency modulation circuit 20 is also disposed inside the housing and is electrically connected to the ground terminal 30. When the electronic device is in frequency modulation mode, it receives a frequency modulation signal by multiplexing the ground terminal 30 of the button circuit 10, thereby realizing the frequency modulation function of the electronic device.

[0017] Optionally, the grounding terminal is a metal layer disposed on the button.

[0018] The grounding terminal, for example, is a metal foil sheet, entirely laid on the button, and is always grounded. When the target button on the electronic device is pressed, the corresponding button circuit comes into contact with the laid grounding metal layer, thus grounding the button circuit. After grounding, the button circuit is triggered to send a corresponding level signal, which is transmitted to the circuit board through the communication trace between the button circuit and the electronic device's circuit board. The circuit board then performs corresponding control processing based on the received level signal and the current button press operation.

[0019] Optionally, the metal layer surrounds the button with traces, and adjacent loops are spaced a predetermined distance apart. The metal layer has a predetermined length for coupling to generate a 1 / 4 wavelength antenna pattern.

[0020] Due to space limitations on electronic devices, and the requirement that the length of the grounding terminal used as an FM signal antenna must meet certain requirements, in one embodiment, a metal layer can be laid around multiple ring-shaped traces disposed on the button, with a predetermined distance between adjacent rings. To account for the coupling effects between corresponding traces in adjacent rings, a certain spacing is maintained between adjacent ring traces. For example, the spacing is more than three times the trace width.

[0021] Alternatively, the metal layer traces can be configured in a serpentine routing pattern on the buttons.

[0022] Therefore, by reasonably setting the routing layout of the metal layer at the grounding end, and using various winding methods to achieve a certain length, the desired length of metal layer routing can be set in a limited space, so that the metal layer can couple to generate a 1 / 4 wavelength antenna mode for receiving frequency modulation signals.

[0023] Optionally, the housing is a metal housing, the button circuit is mounted on a flexible circuit board, and a magnetic shielding component is mounted on the flexible circuit board to shield the metal housing from interference with the frequency modulation signal.

[0024] Corresponding to the button positions, the grounding terminal is located on a flexible printed circuit (FPC). For electronic devices with metal casings, a magnetic shielding component, such as an isolation substrate, is also provided on the flexible printed circuit board. Its main function is to isolate the grounding terminal trace, which is multiplexed as an FM signal antenna, from the metal casing, preventing the grounding terminal trace from being affected by eddy currents in the metal casing, which could interfere with the FM signal and cause loss of the FM signal received at the grounding terminal.

[0025] The flexible circuit board may include a first layer away from the metal housing and a second layer bonded to the metal housing. The grounding terminal trace is disposed on the first layer of the flexible circuit board, and the magnetic shielding component is disposed on the second layer of the flexible circuit board.

[0026] Optionally, the magnetic shielding element is ferrite.

[0027] In one embodiment, optionally, the frequency modulation circuit includes an impedance module, a filtering and amplification module, and a processing module. A first terminal of the impedance module is connected to both the ground terminal and the filtering and amplification module, and a second terminal of the impedance module is grounded. The impedance module is used to ground the ground terminal and block the frequency modulation signal from being grounded. A first terminal of the filtering and amplification module is connected to the first terminal of the impedance module, and a second terminal of the filtering and amplification module is connected to the processing module. The filtering and amplification module is used to filter and amplify the frequency modulation signal. The processing unit is used to process the frequency modulation signal output by the filtering and amplification module for playback by the electronic device.

[0028] like Figure 2 As shown, the frequency modulation circuit includes an impedance module T3, a filter amplification module U1, and a processing module P1. One end of the impedance module T3 is connected to the ground terminal GND and the filter amplification module U1, respectively, and the other end of the impedance module T3 is grounded. The impedance module T3 is used to ground the ground terminal and block the frequency modulation signal received through the ground terminal GND.

[0029] One end of the filter amplification module U1 is connected to the impedance module T3, and the other end is connected to the processing module P1. The filter amplification module U1 is used to filter and amplify the FM signal, and input the processed FM signal to the processing unit P1. The processing unit U1 processes the FM signal output by the filter amplification module U1 and plays it through the electronic device, realizing the FM function of the electronic device.

[0030] Optionally, the impedance module includes a ferrite bead.

[0031] like Figure 2 As shown, the ground terminal GND couples the frequency modulation signal propagating in space. The ground terminal GND is connected to one end of the ferrite bead T3, and the other end of the ferrite bead T3 is grounded.

[0032] The function of ferrite bead T3 is to prevent the FM signal received at the ground terminal GND from being conducted to the ground, thus attenuating the FM signal. It also grounds the button circuit connected to the ground terminal GND. By connecting ferrite bead T3 to the main ground, the ground terminal GND is grounded. This ensures that the button function remains normal, regardless of whether the button is pressed or not, without affecting the reception of the FM signal.

[0033] The presence of the ferrite bead T3 allows the DC grounding signal to be grounded, while the AC frequency modulation signal received through the grounding terminal GND is input to the filter amplifier module U1.

[0034] To minimize FM signal loss and achieve better radio frequency (RF) performance, a matching circuit can be set between the ground terminal and the filter amplifier module U1.

[0035] Optionally, the frequency modulation circuit further includes: a first capacitor, the first end of which is connected to the ground terminal and the impedance module respectively, and the second end of which is connected to the first end of the filter amplification module, for blocking the ground signal of the ground terminal from being transmitted to the filter amplification module; and a first inductor, the first end of which is disposed between the second end of the first capacitor and the first end of the filter amplification module, the second end of which is grounded, and the first inductor is used to form a matching circuit with the first capacitor to perform antenna matching for the frequency modulation signal.

[0036] like Figure 2 As shown, capacitor C and inductor L together form a matching circuit. Capacitor C is placed between the filter amplifier module U1 and the ground terminal GND. One end of inductor L is connected between capacitor C and filter amplifier module U1, and the other end is grounded.

[0037] Ferrite bead T3 prevents the AC FM signal received at ground terminal GND from entering ground, thus allowing the FM signal to continue into the matching circuit. Capacitor C is a DC blocking capacitor; by appropriately setting the values ​​of capacitor C and inductor L, the loss of the FM signal after passing through the matching circuit can be reduced. The frequency signal after passing through the matching circuit continues to enter the amplification and filtering module U1, which processes the FM signal and outputs it.

[0038] In one embodiment, the amplification and filtering module U1 internally consists of two parts: a bandpass filter and a low-noise amplifier, such as... Figure 3 As shown. The frequency signal received at the ground terminal GND is input to the bandpass filter 22 through the FM_IN port, allowing the FM signal in the 76-108MHz band to pass through with low impedance, while other frequency signals are filtered out. The filtered FM signal enters the low-noise amplifier 24 to amplify the FM signal, resulting in an amplified FM signal that is output from the FM_OUT port to the processor connected to the back end.

[0039] like Figure 2As shown, in one embodiment, a contact J1 can be provided on the electrical connection line between the ground terminal GND and the filter amplification module U1, so that a better frequency modulation function can be achieved when a human body touches the contact J1. The frequency modulation circuit is set in the circuit board of the electronic device, and the button circuit and the ground terminal are connected to the circuit board of the electronic device through wiring, and the frequency modulation circuit is electrically connected to the ground terminal.

[0040] Optionally, the buttons include a volume up button, a volume down button, and a power button. The button circuit includes a first button circuit electrically connected to the volume up button, a second button circuit electrically connected to the volume down button, and a third button circuit electrically connected to the power button. One end of each of the first, second, and third button circuits is electrically connected to the ground terminal via a switching element to ground the first, second, or third button circuit. The other ends of each of the first, second, and third button circuits are connected to the circuit board of the electronic device to transmit corresponding button signals to the circuit board for processing when the target button circuit is grounded.

[0041] When the target button is pressed, the corresponding button circuit is grounded through the ground terminal, thereby triggering the button circuit to send out the corresponding level signal. This signal is then transmitted to the circuit board through the communication trace between the button circuit and the circuit board of the electronic device. The circuit board then controls the corresponding control operation of the target button based on the received level signal.

[0042] Below, in conjunction with Figure 4 The example describes the button circuit of an electronic device.

[0043] like Figure 4 As shown, the electronic device is provided with a first button circuit 1 electrically connected to the volume up button, a second button circuit 2 electrically connected to the volume down button, and a third button circuit 3 electrically connected to the power button.

[0044] As shown in the figure, the first button circuit 1 is connected to switch S1, the second button circuit 2 is connected to switch S2, and the third button circuit 3 is connected to switch S3. Each switch is connected to the ground terminal GND. When the target button is pressed, the corresponding switch closes, and the button circuit connected to the target button is grounded through the ground terminal GND, thereby triggering the button circuit to send a corresponding level signal and transmit it to the circuit board for corresponding control, such as controlling the volume up, volume down, or power on, realizing the function of the corresponding button.

[0045] Each button circuit is electrically connected to the circuit board via a communication trace of a predetermined length, which, together with the grounding trace, can transmit the corresponding signal.

[0046] like Figure 5 As shown, the communication traces corresponding to the first button circuit 1, the second button circuit 2, and the third button circuit 3 converge at the button connector J3, and each trace is its own independent signal line. The button connector J3 is connected to the circuit board 40 of the electronic device, thereby transmitting the level signals transmitted by the communication traces of the corresponding button circuits to the circuit board for corresponding processing.

[0047] In this embodiment, the grounding terminal, in addition to grounding the button circuit, can also be reused as a frequency modulation antenna to receive frequency modulation signals and transmit them to the frequency modulation circuit to realize the frequency modulation function of the electronic device.

[0048] In another embodiment, the communication traces of each button circuit can be reused as a frequency modulation antenna to receive frequency modulation signals and transmit them to the frequency modulation circuit to realize the frequency modulation function of the electronic device.

[0049] In this embodiment, by setting a frequency modulation circuit inside the housing of the electronic device and electrically connecting it to the grounding terminal for the button circuit of the electronic device, when the electronic device is in frequency modulation mode, the frequency modulation circuit receives the frequency modulation signal through the grounding terminal. Thus, the frequency modulation circuit can directly reuse the trace of the grounding terminal as an FM antenna and integrate it with the button circuit. The FM function of the electronic device can be directly realized on electronic devices without a reserved FM antenna, such as those with a Type-C interface, without relying on external accessory interface cables such as headphone cables. This reduces the cost of the electronic device and avoids interference from other signals and FM signal attenuation, achieving better frequency modulation performance.

[0050] In addition to reusing the ground terminal of the electronic device as an antenna for receiving FM signals, the above design can also be applied to other button circuit traces or to various devices located on the surface of electronic devices, such as camera decorative parts, to achieve the function of receiving FM signals.

[0051] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An electronic device, comprising: The electronic device comprises a shell, a key and a key circuit; The key is arranged on the shell, and a grounding end is arranged on the key, the grounding end is electrically connected with the key circuit, and the key circuit is grounded; The electronic device further comprises a frequency modulation circuit, the frequency modulation circuit is arranged in the shell, and the frequency modulation circuit is electrically connected with the grounding end; When the electronic device is in a frequency modulation mode, the frequency modulation circuit receives a frequency modulation signal through the grounding end; The grounding end is a metal layer arranged on the key, the metal layer surrounds a wire on the key, and adjacent rings are spaced apart by a predetermined distance.

2. The electronic device of claim 1, wherein, The metal layer has a predetermined length for coupling an antenna mode of 1 / 4 wavelength.

3. The electronic device of claim 1, wherein, The shell is a metal shell, the key circuit is arranged on a flexible circuit board, a magnetic shielding member is arranged on the flexible circuit board, and the magnetic shielding member is used for shielding the metal shell from interfering with the frequency modulation signal.

4. The electronic device of claim 3, wherein, The magnetic shielding member is a ferrite.

5. The electronic device of claim 1, wherein, The frequency modulation circuit comprises an impedance module, a filter amplification module and a processing module, The first end of the impedance module is connected with the grounding end and the filter amplification module respectively, the second end of the impedance module is grounded, and the impedance module is used for grounding the grounding end and blocking the frequency modulation signal from being grounded; The first end of the filter amplification module is connected with the first end of the impedance module, the second end of the filter amplification module is connected with the processing module, and the filter amplification module is used for filtering and amplifying the frequency modulation signal; The processing module is used for processing the frequency modulation signal output by the filter amplification module to play through the electronic device.

6. The electronic device of claim 5, wherein, The impedance module comprises a magnetic bead.

7. The electronic device of claim 5 or 6, wherein, The frequency modulation circuit further comprises: A first capacitor, a first end of the first capacitor is connected with the grounding end and the impedance module respectively, and a second end of the first capacitor is connected with the first end of the filter amplification module, so as to block the ground signal of the grounding end from being transmitted to the filter amplification module; A first inductor, a first end of the first inductor is arranged between the second end of the first capacitor and the first end of the filter amplification module, and a second end of the first inductor is grounded, and the first inductor is used for forming a matching circuit with the first capacitor to perform antenna matching on the frequency modulation signal.

8. The electronic device of claim 1, wherein, The key comprises a volume increase key, a volume decrease key and a power-on key, The key circuit comprises a first key circuit electrically connected with the volume increase key, a second key circuit electrically connected with the volume decrease key, and a third key circuit electrically connected with the power-on key, One end of the first key circuit, the second key circuit and the third key circuit is electrically connected with the grounding end through a switching element, so as to ground the first key circuit, the second key circuit or the third key circuit; The other end of the first key circuit, the second key circuit and the third key circuit is connected with a circuit board of the electronic device, so as to transmit a corresponding key signal to the circuit board for processing when the target key circuit is grounded.

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