CN-122028299-A - Flexible circuit board assembly and electronic equipment

CN122028299ACN 122028299 ACN122028299 ACN 122028299ACN-122028299-A

Abstract

The application discloses a flexible circuit board assembly and electronic equipment, and relates to the technical field of circuits. The flexible circuit board assembly comprises a flexible circuit board body, a first wiring group and a second wiring group, wherein the first wiring group and the second wiring group are arranged on the flexible circuit board body, the second wiring group extends along a first direction, the first wiring group is spirally wound on the outer side of the second wiring group, at least one switch piece is arranged in the first wiring group, and the switch piece is used for adjusting the access length of the first wiring group.

Inventors

YAN CHEN
LI XIAOMING
TONG CONG

Assignees

维沃移动通信有限公司

Dates

Publication Date: 20260512
Application Date: 20260312

Claims (10)

1. The flexible circuit board assembly is characterized by comprising a flexible circuit board body, a first wiring group and a second wiring group, wherein the first wiring group and the second wiring group are arranged on the flexible circuit board body; The second wiring group extends along a first direction, the first wiring group is spirally wound on the outer side of the second wiring group, at least one switch piece is arranged in the first wiring group, and the switch piece is used for adjusting the access length of the first wiring group.
2. The flexible circuit board assembly of claim 1, wherein the flexible circuit board body comprises a first wiring layer, a second wiring layer, and a third wiring layer sequentially spaced apart in a thickness direction of the flexible circuit board body; The second wiring group is arranged on the second wiring layer, and the first wiring group penetrates through the first wiring layer and the third wiring layer.
3. The flexible circuit board assembly of claim 1 or 2, wherein the first set of traces is grounded and the second set of traces is used to transmit signals.
4. The flexible circuit board assembly of claim 3, wherein the first trace group comprises at least two spiral segments, and the at least two spiral segments are arranged in the first direction; Among the at least two spiral segments, two adjacent spiral segments are electrically connected through one switch piece.
5. The flexible circuit board assembly of claim 4 wherein the at least two spiral segments comprise a first spiral segment and a second spiral segment, the at least one switch member comprising a first switch member, wherein the first spiral segment and the second spiral segment are any two adjacent spiral segments of the at least two spiral segments, the first switch member being a switch member connecting the first spiral segment and the second spiral segment; The flexible circuit board body comprises a first wiring layer, a second wiring layer and a third wiring layer which are sequentially arranged at intervals along the thickness direction of the flexible circuit board body, the second wiring layer comprises a grounding layer, the first switch piece comprises a movable end, a first fixed end and a second fixed end, the movable end is electrically connected with one end of the first spiral section, which faces the second spiral section, the first fixed end is electrically connected with one end of the second spiral section, which faces the first spiral section, and the second fixed end is electrically connected with the grounding layer; the movable end is connected with the first fixed end under the condition that the first switch piece is in a first state, and the movable end is disconnected with the second fixed end; and under the condition that the first switch piece is in a second state, the movable end is disconnected from the first fixed end, and the movable end is conducted with the second fixed end.
6. The flexible circuit board assembly of claim 1 or 2, wherein the first set of traces includes at least one of a reset control trace and an interrupt control trace and the second set of traces includes at least a synchronous serial communication interface, SPI, trace and an analog supply voltage trace.
7. An electronic device, comprising a fingerprint module, a circuit board, an antenna module and the flexible circuit board assembly according to any one of claims 1-6, wherein the fingerprint module is electrically connected with the circuit board through the flexible circuit board assembly, the antenna module is disposed on the periphery of the fingerprint module, and the electronic device adjusts the conduction state of the switch member according to the working state of the antenna module so as to adjust the access length of the first routing group.
8. The electronic device of claim 7, wherein at least two working states exist in the at least two spiral segments, the at least two working states are in one-to-one correspondence with at least two antenna frequency bands, and the access lengths corresponding to different working states are different in the at least two working states; And under the condition that the at least two spiral segments are in a first working state, the access length of the first wiring group is matched with an antenna frequency band corresponding to the first working state, wherein the first working state is any one working state of the at least two working states.
9. The electronic device of claim 7, wherein the at least two spiral segments comprise a third spiral segment, a fourth spiral segment, and a fifth spiral segment, the at least one switch comprises a second switch and a third switch, wherein the third spiral segment, the fourth spiral segment, and the fifth spiral segment are any three adjacent spiral segments of the at least two spiral segments, the second switch is a switch connecting the third spiral segment and the fourth spiral segment, and the third switch is a switch connecting the fourth spiral segment and the fifth spiral segment; The access length of the third spiral segment is a first length, the access length of the fourth spiral segment is a second length, the access length of the fifth spiral segment is a third length, the sum of the access lengths of the third spiral segment and the fourth spiral segment is a fourth length, the sum of the access lengths of the fourth spiral segment and the fifth spiral segment is a fifth length, and the sum of the access lengths of the third spiral segment, the fourth spiral segment and the fifth spiral segment is a sixth length; The adjustment range of the access length of the first routing group includes the first length, the second length, the third length, the fourth length, the fifth length and the sixth length.
10. The electronic device of any one of claims 7 to 9, wherein the antenna module and the fingerprint module are respectively disposed on a frame of the electronic device, and the fingerprint module is located outside the antenna module.

Description

Flexible circuit board assembly and electronic equipment Technical Field The application relates to the technical field of circuits, in particular to a flexible circuit board assembly and electronic equipment. Background In the related art, with the development of electronic products, the demand of users for lightening and thinning the electronic products is increasing, and accordingly, the stacking space inside the electronic products is approaching the limit. On one hand, in order to meet the high-speed internet surfing requirement of a user, more antennas are integrated in the electronic product to meet the user communication requirement, and on the other hand, in order to realize more functions, more functional modules such as cameras, fingerprint unlocking, linear motors, loudspeakers and the like are required to be placed in a limited space to meet the functional requirement of the user, so that the user experience is improved. Under such background and trend, the stacking space inside the electronic product is insufficient, and the flexible circuit board (Flexible Printed Circuit Board, FPC) for signal transmission is inevitably required to be increasingly close to the antenna, so that the isolation between the antenna and the FPC is insufficient, and the antenna can interfere with the signal wiring of the FPC when in a working state. Disclosure of Invention The embodiment of the application provides a flexible circuit board assembly and electronic equipment, which can solve the problem that an antenna interferes with signal wiring of an FPC in the related technology. In a first aspect, a flexible circuit board assembly is provided, including a flexible circuit board body, a first wire set and a second wire set, the first wire set and the second wire set being disposed on the flexible circuit board body; The second wiring group extends along a first direction, the first wiring group is spirally wound on the outer side of the second wiring group, at least one switch piece is arranged in the first wiring group, and the switch piece is used for adjusting the access length of the first wiring group. In a second aspect, an electronic device is provided, including a fingerprint module, a circuit board, an antenna module and a flexible circuit board assembly according to the first aspect, where the fingerprint module is electrically connected with the circuit board through the flexible circuit board assembly, the antenna module is disposed on a periphery of the fingerprint module, and the electronic device adjusts a conduction state of the switch element according to a working state of the antenna module, so as to adjust an access length of the first routing group. In the embodiment of the application, the flexible circuit board assembly comprises a flexible circuit board body, a first wiring group and a second wiring group, wherein the first wiring group and the second wiring group are arranged on the flexible circuit board body; the first wiring group is spirally wound on the outer side of the second wiring group, and because the first wiring group is spirally, the first wiring group can be equivalent to a solenoid coil without a magnetic core, so that when the flexible circuit board assembly is positioned in the radiation field range of the antenna, an alternating electromagnetic field generated by the antenna can be coupled to the first wiring group, the first wiring group can generate an induction field opposite to the antenna electromagnetic field, and the induction field can offset the influence of the antenna electromagnetic field on the wiring inside the flexible circuit board assembly, thereby reducing the induction voltage of the antenna coupled to the flexible circuit board assembly and further improving the anti-interference capability of the flexible circuit board assembly. In addition, at least one switch piece is arranged in the first wiring group, and the switch piece is used for adjusting the access length of the first wiring group, so that the access length of the first wiring group can be adjusted by controlling the on-off state of the switch piece, the equivalent inductance of the first wiring group is changed, the equivalent impedance under a specific frequency band is favorably optimized, the resonance effect caused by turn-to-turn distributed capacitance is reduced, and the interference of the antenna to signals in the signal wiring is further reduced. Drawings FIG. 1 is a side view of a fingerprint module and a flexible circuit board assembly according to an embodiment of the present application; FIG. 2 is a top view of a fingerprint module and a flexible printed circuit board assembly according to an embodiment of the present application; FIG. 3 is a schematic cross-sectional view of a fingerprint module and a flexible printed circuit board assembly according to an embodiment of the present application; FIG. 4 is a second top view of the fingerprint module and the flexible circuit