CN115911824A

CN115911824A - Electronic device

Info

Publication number: CN115911824A
Application number: CN202211488410.6A
Authority: CN
Inventors: 陈乐华
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2022-11-25
Filing date: 2022-11-25
Publication date: 2023-04-04

Abstract

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

Description

Electronic device

Technical Field

The application belongs to the technical field of communication, and particularly relates to an electronic device.

Background

Electronic devices typically use a 3.5-inch headset cord as a Frequency Modulation (FM) antenna to implement FM functionality. Along with the intellectuality of electronic equipment product, the data line interface on the equipment gradually turns into Type-C interface, including earphone data line interface. Because the FM antenna is not reserved to the Type-C interface, lead to the FM antenna not have hookup location, can't realize the FM function.

How to realize the FM function on the electronic equipment without reserving the FM antenna is a technical problem to be solved at present.

Disclosure of Invention

The embodiment of the application aims to provide electronic equipment which can realize a frequency modulation function on the electronic equipment without a reserved FM antenna.

In a first aspect, an embodiment of the present application provides an electronic device, including a housing, a key, and a key circuit; the key is arranged on the shell, a grounding end is arranged on the key, and the grounding end is electrically connected with the key circuit and used for grounding the key circuit; the electronic equipment 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; and when the electronic equipment is in a frequency modulation mode, the frequency modulation circuit receives a frequency modulation signal through the grounding end.

In the embodiment of the application, the frequency modulation circuit is arranged in the shell of the electronic equipment and is electrically connected with the grounding end which is used for grounding the key circuit of the electronic equipment, when the electronic equipment is in a frequency modulation mode, the frequency modulation circuit receives a frequency modulation signal through the grounding end, so that the frequency modulation circuit can directly multiplex the wiring of the grounding end to be fused as an FM antenna and the key circuit, the FM function of the electronic equipment can be directly realized on the electronic equipment without reserving the FM antenna, the cost of the electronic equipment is reduced without depending on external accessory interface wires such as earphone wires and the like, meanwhile, other signal interference and FM signal attenuation can be avoided, and more excellent frequency modulation performance is realized.

Drawings

Fig. 1 is a block diagram of an electronic device according to an embodiment of the present application.

Fig. 2 is a schematic circuit diagram of a frequency modulation antenna circuit according to an embodiment of the present application.

Fig. 3 is a schematic circuit diagram of an amplifying and filtering module according to an embodiment of the present application.

Fig. 4 is a schematic circuit structure diagram of a key circuit according to an embodiment of the present application.

Fig. 5 is a schematic diagram of communication traces of a key circuit according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The electronic device provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

In one embodiment of the present application, there is provided an electronic device including a housing, a key, and a key circuit; the key is arranged on the shell, a grounding end is arranged on the key, and the grounding end is electrically connected with the key circuit and is used for grounding the key circuit; the electronic equipment 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; and when the electronic equipment is in a frequency modulation mode, the frequency modulation circuit receives a frequency modulation signal through the grounding end.

As shown in fig. 1, the electronic device according to the embodiment of the present application includes a key circuit 10 and a frequency modulation circuit 20, wherein a housing of the electronic device is provided with a key, and the key is provided with a ground terminal 30 electrically connected to the key circuit 10. The frequency modulation circuit 20 is also disposed in the housing, and the frequency modulation circuit 20 is electrically connected to the ground terminal 30, and is configured to receive the frequency modulation signal through the ground terminal 30 of the multiplexing key circuit 10 when the electronic device is in the frequency modulation mode, so as to implement the frequency modulation function of the electronic device.

Optionally, the ground terminal is a metal layer disposed on the key.

The grounding terminal is, for example, a metal foil, and is entirely laid on the key, and the grounding terminal is always grounded. When the target key on the electronic equipment is pressed down, the corresponding key circuit is contacted with the laid grounding end metal layer, so that the key circuit is grounded. After grounding, the key circuit is triggered to send out a corresponding level signal, the level signal is transmitted to a circuit board of the electronic equipment through a communication wire between the key circuit and the circuit board, and the circuit board performs corresponding control processing according to the received level signal and the pressing operation of the target key at the moment.

Optionally, the metal layer is routed around the key, and a predetermined distance is provided between adjacent rings. The metal layer has a predetermined length for coupling to produce a 1/4 wavelength antenna pattern.

Due to the limited space on the electronic equipment, the length of the ground terminal which is multiplexed as the FM signal antenna also needs to meet certain requirements. In one embodiment, the metal layer may be laid around a plurality of loop-shaped traces disposed on the keys, and adjacent two loops are spaced apart by a predetermined distance. The coupling influence between the wires corresponding to the adjacent rings is considered, and a certain distance is kept between the adjacent ring-shaped wires. For example, the pitch is more than 3 times the line width of the trace.

Alternatively, the metal layer routing can also be arranged on the key in a serpentine winding manner.

Therefore, the metal layer wiring layout of the grounding end is reasonably arranged, the metal layer wiring with various forms reaches a certain length in a winding mode, and the metal layer wiring with the expected length is arranged in a limited space, so that the metal layers can be coupled to generate an antenna mode with 1/4 wavelength for receiving frequency modulation signals.

Optionally, the housing is a metal housing, the key circuit is disposed on a flexible circuit board, and a magnetic isolation member is disposed on the flexible circuit board and used for shielding interference of the metal housing on the frequency modulation signal.

The ground terminal is disposed on a Flexible Printed Circuit (FPC) corresponding to the key position. For the case that the electronic device is a metal shell, a magnetic isolation piece, such as an isolation substrate, is further arranged on the flexible circuit board, and the magnetic isolation piece is mainly used for isolating the grounding terminal wiring multiplexed as the FM signal antenna from the metal shell, so that the grounding terminal wiring is prevented from being influenced by the eddy current of the metal shell, and the loss of the frequency modulation signal received by the grounding terminal due to the interference of the frequency modulation signal is avoided.

The flexible circuit board can include the first layer of keeping away from the metal casing and the second floor that bonds with the metal casing, and the earthing terminal is walked the line and is set up on the first layer of flexible circuit board, and the magnetism piece that separates sets up on the second floor of flexible circuit board.

Optionally, the magnetic separator is ferrite.

In an embodiment, optionally, the frequency modulation circuit includes an impedance module, a filtering and amplifying module, and a processing module, a first end of the impedance module is connected to the ground terminal and the filtering and amplifying module, respectively, a second end of the impedance module is grounded, and the impedance module is configured to ground the ground terminal and block the frequency modulation signal from being grounded; the first end of the filtering and amplifying module is connected with the first end of the impedance module, the second end of the filtering and amplifying module is connected with the processing module, and the filtering and amplifying module is used for filtering and amplifying the frequency modulation signal; the processing unit is used for processing the frequency modulation signal output by the filtering and amplifying module so as to play the frequency modulation signal through the electronic equipment.

As shown in fig. 2, the frequency modulation circuit includes an impedance module T3, a filtering and amplifying module U1, and a processing module P1. One end of the impedance module T3 is connected to the ground terminal GND and the filtering and amplifying module U1, the other end of the impedance module T3 is grounded, and the impedance module T3 is configured to ground the ground terminal and block the frequency modulation signal received through the ground terminal GND from being grounded.

One end of the filtering and amplifying module U1 is connected to the impedance module T3, and the other end is connected to the processing module P1, and the filtering and amplifying module U1 is configured to perform filtering and amplifying processing on the frequency modulation signal, and input the processed frequency modulation signal FM to the processing unit P1. The processing unit U1 processes the frequency modulation signal FM output by the filtering amplification module U1 and plays the FM signal FM through the electronic equipment to realize the frequency modulation function of the electronic equipment.

Optionally, the impedance module comprises a magnetic bead.

As shown in fig. 2, the ground GND is coupled to the spatially propagated frequency modulation signal, the ground GND is connected to one end of the magnetic bead T3, and the other end of the magnetic bead T3 is grounded.

The magnetic bead T3 is used for preventing the frequency modulation signal received by the ground terminal GND from being led into the ground, so that the frequency modulation signal is attenuated, and meanwhile, the function of grounding the key circuit connected with the ground terminal GND is realized. The magnetic bead T3 is connected with the main ground, so that the grounding end GND is grounded. Therefore, the function of the key can be kept normal, and the receiving of the frequency modulation signal is not influenced whether the key is pressed or not.

Due to the existence of the magnetic bead T3, a direct current ground signal can be grounded, and an alternating current frequency modulation signal received through the ground terminal GND is input to the filtering and amplifying module U1.

In order to minimize loss of the Frequency modulation signal and achieve better Radio Frequency (RF) performance, a matching circuit may be disposed between the ground terminal and the filtering and amplifying module U1.

Optionally, the frequency modulation circuit further includes: a first capacitor, a first end of which is connected to the ground terminal and the impedance module, respectively, and a second end of which is connected to the first end of the filtering and amplifying module, and is configured to block a ground signal of the ground terminal from being transmitted to the filtering and amplifying module; the first end of the first inductor is arranged between the second end of the first capacitor and the first end of the filtering amplification module, the second end of the first inductor is grounded, and the first inductor and the first capacitor form a matching circuit to perform antenna matching on the frequency modulation signal.

As shown in fig. 2, the capacitor C and the inductor L jointly form a matching circuit, wherein the capacitor C is disposed between the filtering and amplifying module U1 and the ground GND, one end of the inductor L is connected between the capacitor C and the filtering and amplifying module U1, and the other end is grounded.

The bead T3 blocks the ac fm signal received by the ground GND from entering ground, so that the fm signal continues to enter the matching circuit. The capacitor C is a direct current blocking capacitor, and loss of the frequency modulation signal after passing through the matching circuit can be reduced by properly setting numerical values of the capacitor C and the inductor L. And the frequency signal passing through the matching circuit continuously enters the amplifying and filtering module U1, and the amplifying and filtering module U1 processes the frequency modulation signal and outputs the processed frequency modulation signal.

In one embodiment, the amplification and filtering module U1 is internally composed of two parts: a bandpass filter and a low noise amplifier as shown in fig. 3. The frequency signal received by the ground terminal GND is input to the band-pass filter 22 from the port FM _ IN, so that the frequency-modulated signal IN the 76-108MHz band IN the frequency-modulated signal passes through with low resistance, and the frequency signals IN other bands are filtered out. The filtered frequency modulated signal enters a low noise amplifier 24 to amplify the frequency modulated signal to obtain an amplified frequency modulated signal and output from the port FM _ OUT to a back-end connected processor.

As shown in fig. 2, in an embodiment, a contact J1 may be disposed on an electrical connection line between the ground GND and the filtering and amplifying module U1, so that when a human body contacts the contact J1, a frequency modulation function with a good effect may be achieved. The frequency modulation circuit is arranged in a circuit board of the electronic equipment, the key circuit and the grounding end are connected to the circuit board of the electronic equipment through the wiring, and the frequency modulation circuit is electrically connected with the grounding end.

Optionally, the keys include a volume-up key, a volume-down key and a power-on key, the key circuit includes a first key circuit electrically connected to the volume-up key, a second key circuit electrically connected to the volume-down key and a third key circuit electrically connected to the power-on key, and one end of each of the first key circuit, the second key circuit and the third key circuit is electrically connected to the ground terminal through a switch element, and is configured to ground the first key circuit, the second key circuit or the third key circuit; the other ends of the first key circuit, the second key circuit and the third key circuit are respectively connected with a circuit board of the electronic equipment so as to transmit corresponding key signals to the circuit board for processing when the target key circuit is grounded.

When the target key is pressed down, the corresponding key circuit is grounded through the grounding end, so that the key circuit is triggered to send out a corresponding level signal, the level signal is transmitted to the circuit board through the communication wiring between the key circuit and the circuit board of the electronic equipment, and the circuit board controls the control operation corresponding to the target key according to the received level signal.

Next, a key circuit of the electronic device is described with reference to an example of fig. 4.

As shown in fig. 4, the electronic device is provided with a first key circuit 1 electrically connected to the volume-up key, a second key circuit 2 electrically connected to the volume-down key, and a third key circuit 3 electrically connected to the power-on key.

As shown in the figure, the first key circuit 1 is connected to the switch S1, the second key circuit 2 is connected to the switch S2, the third key circuit 3 is connected to the switch S3, and each switch is connected to the ground GND. When the target key is pressed down, the corresponding switch is closed, and the key circuit correspondingly connected with the target key is grounded through the ground terminal GND, so that the key circuit is triggered to send out a corresponding level signal and transmit the level signal to the circuit board to perform corresponding control, such as volume increase, volume decrease or startup, to realize the function of the corresponding key.

Each key circuit is electrically connected with the circuit board through a communication wire with a preset length, and can transmit corresponding signals together with a wire of a grounding end.

As shown in fig. 5, the communication traces corresponding to the first key circuit 1, the second key circuit 2, and the third key circuit 3 are gathered at the key connector J3, and each trace is an independent signal line. The key connector J3 is connected to the circuit board 40 of the electronic device, so as to transmit the level signal transmitted by the communication trace of the corresponding key circuit to the circuit board for corresponding processing.

In the embodiment of the application, the grounding end can be multiplexed as a frequency modulation antenna besides grounding the key circuit, and receives the frequency modulation signal and transmits the frequency modulation signal to the frequency modulation circuit to realize the frequency modulation function of the electronic equipment.

In another embodiment, the communication traces of each key circuit may be multiplexed as a frequency modulation antenna to receive a frequency modulation signal and transmit the frequency modulation signal to a frequency modulation circuit to implement a frequency modulation function of the electronic device.

In this application embodiment, through set up frequency modulation circuit in electronic equipment's casing, and be connected with the earthing terminal electricity that is used for electronic equipment's button circuit ground connection, when electronic equipment is in the frequency modulation mode, frequency modulation circuit passes through the earthing terminal and receives the frequency modulation signal, thereby frequency modulation circuit can directly multiplex the line of earthing terminal and fuse as FM antenna and button circuit, can directly realize electronic equipment's FM function on the electronic equipment such as Type-C interface that does not reserve the FM antenna, need not rely on for example external accessory interface wire materials such as earphone cord when reducing electronic equipment cost, still can avoid other signal interference and FM signal attenuation, realize more excellent frequency modulation performance.

In addition, except that the grounding end of the multiplexing electronic equipment is used as an antenna for receiving the frequency modulation signal, the design scheme can also be applied to other key circuit wiring or applied to various devices on the surface of the electronic equipment such as a camera decoration piece and the like so as to realize the frequency modulation signal receiving function.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An electronic device is characterized by comprising a shell, a key and a key circuit;

the key is arranged on the shell, a grounding end is arranged on the key, and the grounding end is electrically connected with the key circuit and used for grounding the key circuit;

the electronic equipment 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;

and when the electronic equipment is in a frequency modulation mode, the frequency modulation circuit receives a frequency modulation signal through the grounding terminal.

2. The electronic device of claim 1, wherein the ground terminal is a metal layer disposed on the key.

3. The electronic device of claim 2, wherein the metal layer surrounds the traces on the keys with a predetermined distance between adjacent rings.

4. An electronic device according to claim 2 or 3, characterized in that the metal layer has a predetermined length for coupling to produce an antenna pattern of 1/4 wavelength.

5. The electronic device of claim 1, wherein the housing is a metal housing, the key circuit is disposed on a flexible circuit board, and a magnetic shielding member is disposed on the flexible circuit board and used for shielding interference of the metal housing with the frequency modulation signal.

6. The electronic device of claim 5, wherein the magnetic separator is ferrite.

7. The electronic device of claim 1, wherein the frequency modulation circuit comprises an impedance module, a filtering and amplifying module, and a processing module,

the first end of the impedance module is respectively connected with the grounding end and the filtering amplification module, 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 filtering and amplifying module is connected with the first end of the impedance module, the second end of the filtering and amplifying module is connected with the processing module, and the filtering and amplifying module is used for filtering and amplifying the frequency modulation signal;

the processing unit is used for processing the frequency modulation signal output by the filtering and amplifying module so as to play the frequency modulation signal through the electronic equipment.

8. The electronic device of claim 7, wherein the impedance module comprises a magnetic bead.

9. The electronic device of claim 7 or 8, wherein the frequency modulation circuit further comprises:

a first capacitor, a first end of which is connected to the ground terminal and the impedance module, respectively, and a second end of which is connected to the first end of the filtering and amplifying module, and is configured to block a ground signal of the ground terminal from being transmitted to the filtering and amplifying module;

the first end of the first inductor is arranged between the second end of the first capacitor and the first end of the filtering amplification module, the second end of the first inductor is grounded, and the first inductor and the first capacitor form a matching circuit to perform antenna matching on the frequency modulation signal.

10. The electronic device of claim 1, wherein the keys comprise a volume up key, a volume down key, and a power on key,

the key circuit comprises a first key circuit electrically connected with the volume-up key, a second key circuit electrically connected with the volume-down key and a third key circuit electrically connected with the power-on key,

one end of each of the first key circuit, the second key circuit and the third key circuit is electrically connected with the grounding end through a switch element and is used for grounding the first key circuit, the second key circuit or the third key circuit;

the other ends of the first key circuit, the second key circuit and the third key circuit are respectively connected with a circuit board of the electronic equipment so as to transmit corresponding key signals to the circuit board for processing when the target key circuit is grounded.