CN109188097B - Device and method for testing ground impedance of electromagnetic shielding film of single FPC (flexible printed circuit) - Google Patents

Device and method for testing ground impedance of electromagnetic shielding film of single FPC (flexible printed circuit) Download PDF

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Publication number
CN109188097B
CN109188097B CN201811240491.1A CN201811240491A CN109188097B CN 109188097 B CN109188097 B CN 109188097B CN 201811240491 A CN201811240491 A CN 201811240491A CN 109188097 B CN109188097 B CN 109188097B
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shielding film
point
test point
electromagnetic
film test
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CN109188097A (en
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闻娟
施景辉
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Jiangxi Holitech Technology Co Ltd
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Jiangxi Holitech Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/16Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18Measuring resistance to earth, i.e. line to ground
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/001Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The utility model provides a monolithic FPC's electromagnetic shield membrane earth impedance testing arrangement, it includes electromagnetic shield membrane (1), vertical portion (2), horizontal portion (3), recess portion (4), shielding membrane break-over point (5), shielding membrane test point (6), monolithic FPC's electromagnetic shield membrane includes vertical portion, horizontal portion, and horizontal portion's right-hand member has recess portion, and recess portion includes first cell wall (41), second cell wall (42), first cell wall, second cell wall mutually perpendicular, its characterized in that: the shielding film conduction point (5) is positioned in the electromagnetic shielding film (1), the shielding film test point (6) is positioned in the groove part (4), and the shielding film conduction point is electrically communicated with the shielding film test point. The invention can be tested only by one or more exposed test point contact pens; the window area which is conducted with the EMI is extended, and the EMI and grounding effect is measured by measuring the conductivity between the extended point and the ground.

Description

Device and method for testing ground impedance of electromagnetic shielding film of single FPC (flexible printed circuit)
Technical Field
The invention relates to the field of electromagnetic shielding film testing of a single FPC (flexible printed circuit), in particular to a device and a method for testing the impedance of the electromagnetic shielding film of the single FPC to the ground.
Background
The electromagnetic shielding film is a material for shielding electromagnetic interference (EMI), and is a shielding body (Shield) made of conductive and magnetic material to limit electromagnetic waves within a certain range, so that the electromagnetic waves are restrained or attenuated when being coupled or radiated from one side of the shielding body to the other side; the electronic product is interfered by high-frequency electromagnetic waves to influence the quality of the product, the shielding effect of the shielding film is particularly important, the grounding of the electromagnetic shielding film is one of important preconditions for playing the role of the electromagnetic shielding film, and the test of the grounding impedance value is a method for checking whether the shielding film is effectively grounded.
In the prior art, when the single FPC measures the impedance of the electromagnetic shielding film to the ground, the insulating layer on the surface of the shielding film needs to be scraped, but the scraping force is difficult to control, and the shield layer of the shielding film is difficult to contact and damage the FPC.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a measurement scheme of the impedance of a single FPC electromagnetic shielding film to the ground, and the effectiveness of the grounding of the electromagnetic shielding film is detected. By adding a test circuit on a single FPC; and leading out a test point of the electromagnetic shielding film through a copper sheet windowing point, wherein the test point is communicated with the shielding film, and measuring the resistance between the test point and GND through a universal meter.
After improvement, only one exposed test point is needed to contact the meter pen for testing; the window area which is conducted with the EMI is extended, and the EMI and grounding effect is measured by measuring the conductivity between the extended point and the ground.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a monolithic FPC's electromagnetic shield membrane earth impedance testing arrangement, it includes electromagnetic shield membrane (1), vertical portion (2), horizontal portion (3), recess portion (4), shielding membrane break-over point (5), shielding membrane test point (6), monolithic FPC's electromagnetic shield membrane includes vertical portion, horizontal portion, and horizontal portion's right-hand member has recess portion, and recess portion includes first cell wall (41), second cell wall (42), first cell wall, second cell wall mutually perpendicular, its characterized in that: the shielding film conduction point (5) is positioned in the electromagnetic shielding film (1), the shielding film test point (6) is positioned in the groove part (4), and the shielding film conduction point is electrically communicated with the shielding film test point.
Further, the distance from the conducting point of the shielding film to the first groove wall is equal to the distance from the testing point of the shielding film to the first groove wall, and the distance from the testing point of the shielding film to the first groove wall is 0.35-0.40 times of the depth (T) of the groove part.
Further, the distance from the shielding film test point to the second groove wall is 0.95-1.0 times of the depth (T) of the groove part.
Further, the shielding film test points comprise a first shielding film test point (61) and a second shielding film test point (62), the first shielding film test point and the second shielding film test point are positioned on the same vertical line, the first shielding film test point and the second shielding film test point are electrically communicated with the shielding film conduction point, and the connecting lines of the first shielding film test point, the second shielding film test point and the shielding film conduction point form a triangle similar to a right triangle.
Further, a testing circuit is added on the single FPC, a shielding film testing point of the electromagnetic shielding film is led out through a copper sheet windowing point, the shielding film testing point is communicated with the electromagnetic shielding film, and the resistance between the shielding film testing point and GND is measured through a universal meter.
Further, the test is performed by placing one or more bare test points of the shielding film in contact with the multimeter pen, by extending the fenestration area that is in communication with the EMI, and by measuring the conductivity between the extended test points of the shielding film and ground, EMI and ground effects are measured.
The invention can be tested only by one or more exposed test point contact pens; the window area which is conducted with the EMI is extended, and the EMI and grounding effect is measured by measuring the conductivity between the extended point and the ground.
Drawings
FIG. 1 is a schematic diagram of a device for testing the impedance of an electromagnetic shielding film of a single FPC to ground;
fig. 2 is a schematic structural diagram of another embodiment of the electromagnetic shielding film-to-ground impedance testing device of the monolithic FPC of the present invention.
In the figure: the electromagnetic shielding film 1, the vertical part 2, the horizontal part 3, the groove part 4, the first groove wall 41, the second groove wall 42, the shielding film conduction point 5, the shielding film test point 6, the first shielding film test point 61 and the second shielding film test point 62.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
See fig. 1-2: the device for testing the impedance of the electromagnetic shielding film of the single FPC to the ground comprises an electromagnetic shielding film 1, a vertical part 2, a horizontal part 3, a groove part 4, a shielding film conducting point 5 and a shielding film test point 6.
The electromagnetic shielding film 1 of the single FPC comprises a vertical part 2 and a horizontal part 3, the right end of the horizontal part 3 is provided with a groove part 4, the groove part 4 comprises a first groove wall 41 and a second groove wall 42, the first groove wall 41 and the second groove wall 42 are mutually perpendicular, a shielding film conduction point 5 is positioned in/on the electromagnetic shielding film 1, a shielding film test point 6 is positioned in the groove part 4, and the shielding film conduction point 5 is electrically communicated with the shielding film test point 6.
The distance from the shielding film conduction point 5 to the first groove wall 41 is equal to the distance from the shielding film test point 6 to the first groove wall 41, the distance from the shielding film test point 6 to the first groove wall 41 is 0.35-0.40 times of the depth T of the groove part 4, and the distance from the shielding film test point 6 to the second groove wall 42 is 0.95-1.0 times of the depth T of the groove part 4.
Referring to fig. 2, the shielding film test point 6 includes a first shielding film test point 61 and a second shielding film test point 62, where the first shielding film test point 61 and the second shielding film test point 62 are located on the same vertical line, and the first shielding film test point 61 and the second shielding film test point 62 are electrically connected with the shielding film conduction point 5, and the connection lines of the first shielding film test point 61, the second shielding film test point 62 and the shielding film conduction point 5 form a right triangle/are similar to a right triangle. The accuracy and the effectiveness of measurement are further improved by arranging a plurality of shielding film test points.
The invention can be tested only by one or more exposed test point contact pens; the window area which is conducted with the EMI is extended, and the EMI and grounding effect is measured by measuring the conductivity between the extended point and the ground.
The above-described embodiments are illustrative of the present invention and are not intended to be limiting, and it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents.

Claims (1)

1. The utility model provides a monolithic FPC's electromagnetic shield membrane earth impedance testing arrangement, it includes electromagnetic shield membrane (1), vertical portion (2), horizontal portion (3), recess portion (4), shielding membrane break-over point (5), shielding membrane test point (6), monolithic FPC's electromagnetic shield membrane includes vertical portion, horizontal portion, and horizontal portion's right-hand member has recess portion, and recess portion includes first cell wall (41), second cell wall (42), first cell wall, second cell wall mutually perpendicular, its characterized in that: the shielding film conduction point (5) is positioned in the electromagnetic shielding film (1), the shielding film test point (6) is positioned in the groove part (4), and the shielding film conduction point is electrically communicated with the shielding film test point;
the distance from the conducting point of the shielding film to the first groove wall is equal to the distance from the testing point of the shielding film to the first groove wall, and the distance from the testing point of the shielding film to the first groove wall is 0.35-0.40 times of the depth (T) of the groove part;
the distance from the shielding film test point to the second groove wall is 0.95-1.0 times of the depth (T) of the groove part;
the shielding film test points comprise a first shielding film test point (61) and a second shielding film test point (62), the first shielding film test point and the second shielding film test point are positioned on the same vertical line, the first shielding film test point and the second shielding film test point are electrically communicated with the shielding film conduction point, and the connecting lines of the first shielding film test point, the second shielding film test point and the shielding film conduction point form a right triangle;
a test circuit is added on a single FPC, a shielding film test point of an electromagnetic shielding film is led out through a copper sheet windowing point, the shielding film test point is communicated with the electromagnetic shielding film, and the resistance between the shielding film test point and GND is measured through a universal meter;
the test is performed by placing one or more bare test points of the shielding film in contact with the multimeter pen, by extending the fenestration area that is conductive to the EMI, and by measuring the conductivity between the extended test points of the shielding film and ground, the EMI and ground effects are measured.
CN201811240491.1A 2018-10-24 2018-10-24 Device and method for testing ground impedance of electromagnetic shielding film of single FPC (flexible printed circuit) Active CN109188097B (en)

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CN201811240491.1A CN109188097B (en) 2018-10-24 2018-10-24 Device and method for testing ground impedance of electromagnetic shielding film of single FPC (flexible printed circuit)

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CN201811240491.1A CN109188097B (en) 2018-10-24 2018-10-24 Device and method for testing ground impedance of electromagnetic shielding film of single FPC (flexible printed circuit)

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CN109188097B true CN109188097B (en) 2023-09-15

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0697694A (en) * 1992-09-16 1994-04-08 Hitachi Ltd Electromagnetic shield film and shield structure body using this film
JP2014212258A (en) * 2013-04-19 2014-11-13 大成建設株式会社 Electromagnetic shielding film attachment tool for electromagnetic shielding window, and electromagnetic shielding window using the same and construction method of electromagnetic shielding window
CN204422905U (en) * 2015-01-05 2015-06-24 深圳同兴达科技股份有限公司 A kind of FPC structure of liquid crystal display EMI suppression
CN204836785U (en) * 2015-08-03 2015-12-02 金龙机电(东莞)有限公司 Interconnecting link board and electronic equipment
CN105873359A (en) * 2016-06-13 2016-08-17 惠州Tcl移动通信有限公司 Flexible circuit board for capacitive touch screen and detection method of electromagnetic shielding film of flexible circuit board for capacitive touch screen
CN206181714U (en) * 2016-11-30 2017-05-17 江西合力泰科技有限公司 Flexible shield membrane, FPC shield assembly and cell -phone touch and show module shield assembly
CN208953617U (en) * 2018-10-24 2019-06-07 江西合力泰科技有限公司 A kind of electromagnetic shielding film earth impedance test device of monolithic FPC

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0697694A (en) * 1992-09-16 1994-04-08 Hitachi Ltd Electromagnetic shield film and shield structure body using this film
JP2014212258A (en) * 2013-04-19 2014-11-13 大成建設株式会社 Electromagnetic shielding film attachment tool for electromagnetic shielding window, and electromagnetic shielding window using the same and construction method of electromagnetic shielding window
CN204422905U (en) * 2015-01-05 2015-06-24 深圳同兴达科技股份有限公司 A kind of FPC structure of liquid crystal display EMI suppression
CN204836785U (en) * 2015-08-03 2015-12-02 金龙机电(东莞)有限公司 Interconnecting link board and electronic equipment
CN105873359A (en) * 2016-06-13 2016-08-17 惠州Tcl移动通信有限公司 Flexible circuit board for capacitive touch screen and detection method of electromagnetic shielding film of flexible circuit board for capacitive touch screen
CN206181714U (en) * 2016-11-30 2017-05-17 江西合力泰科技有限公司 Flexible shield membrane, FPC shield assembly and cell -phone touch and show module shield assembly
CN208953617U (en) * 2018-10-24 2019-06-07 江西合力泰科技有限公司 A kind of electromagnetic shielding film earth impedance test device of monolithic FPC

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