CN109188097A - A kind of the electromagnetic shielding film earth impedance test device and method of monolithic FPC - Google Patents
A kind of the electromagnetic shielding film earth impedance test device and method of monolithic FPC Download PDFInfo
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- CN109188097A CN109188097A CN201811240491.1A CN201811240491A CN109188097A CN 109188097 A CN109188097 A CN 109188097A CN 201811240491 A CN201811240491 A CN 201811240491A CN 109188097 A CN109188097 A CN 109188097A
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- Prior art keywords
- point
- screened film
- test point
- electromagnetic shielding
- screened
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
Abstract
A kind of electromagnetic shielding film earth impedance test device of monolithic FPC, it includes electromagnetic shielding film (1), vertical portion (2), horizontal part (3), concave part (4), screened film firing point (5), screened film test point (6), the electromagnetic shielding film of monolithic FPC includes vertical portion, horizontal part, the right end of horizontal part has concave part, concave part includes the first cell wall (41), second cell wall (42), first cell wall, second cell wall is mutually perpendicular to, it is characterized by: screened film firing point (5) is located in electromagnetic shielding film (1), screened film test point (6) is located in concave part (4), screened film firing point and screened film test point electrical property connection.Present invention only requires one or more exposed test point contact test pencils to test；It is in fact exactly that the windowed regions be connected with EMI are extended out, by the conduction between the measurement point to extend out and ground, to measure EMI and earthing effect.
Description
Technical field
The present invention relates to the electromagnetic shielding film testing field of monolithic FPC (flexible circuit board) more particularly to a kind of monolithic FPC
Electromagnetic shielding film earth impedance test device and method.
Background technique
Electromagnetic shielding film is a kind of material for shielding EMI (electromagnetic interference), is the shield made of conductive magneto-conductive material
(Shield) electromagnetic wave is limited in a certain range, when electromagnetic wave being made to couple from the one side of shield or be radiated another side
It is suppressed or decays；Electronic product will receive the interference of frequency electromagnetic waves, and influence the quality of product, at this time the screen of screened film
The effect of covering is particularly important, and electromagnetic shielding film ground connection is one of the important prerequisite for playing its effect, and test earth impedance value is to examine
Screened film whether the method for effective grounding.
In the prior art, when monolithic FPC surveys electromagnetic shielding film earth impedance, need to scrape off screened film surface insulation layer, but
It is that the dynamics scraped is difficult to control, is difficult to touch the shild layer of screened film and FPC can be damaged.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, a kind of monolithic FPC electromagnetic shielding film is provided over the ground
The measurement scheme of impedance, the validity of detection electromagnetic shielding film ground connection.By increasing test circuit on monolithic FPC；Pass through copper
Skin window point draws the test point of electromagnetic shielding film, this test point has been connected to screened film film, has measured this test point by multimeter
Resistance value between GND.
After improvement, it is only necessary to which an exposed test point contact test pencil can be tested；It is in fact exactly being connected with EMI
Windowed regions extend out, by the conduction between the measurement point to extend out and ground, to measure EMI and earthing effect.
To achieve the goals above, the technical solution adopted by the present invention are as follows:
A kind of electromagnetic shielding film earth impedance test device of monolithic FPC comprising electromagnetic shielding film (1), vertical portion
(2), horizontal part (3), concave part (4), screened film firing point (5), screened film test point (6), the electromagnetic shielding film packet of monolithic FPC
Vertical portion, horizontal part are included, the right end of horizontal part has concave part, and concave part includes the first cell wall (41), the second cell wall (42), the
One cell wall, the second cell wall are mutually perpendicular to, it is characterised in that: screened film firing point (5) is located in electromagnetic shielding film (1), screened film
Test point (6) is located in concave part (4), screened film firing point and screened film test point electrical property connection.
Further, screened film firing point to the first cell wall distance at a distance from screened film test point to the first cell wall phase
Distance Deng, screened film test point to the first cell wall is 0.35-0.40 times of concave part depth (T).
Further, the distance of screened film test point to the second cell wall is 0.95-1.0 times of concave part depth (T).
Further, screened film test point includes the first screened film test point (61), secondary shielding film test point (62), the
One screened film test point, secondary shielding film test point are located on same vertical line, and the first screened film test point, secondary shielding film are surveyed
Pilot and screened film firing point electrical communication, the first screened film test point, secondary shielding film test point, screened film firing point three
Line composition be similar to right angled triangle.
Further, by increasing test circuit on monolithic FPC, the screen of electromagnetic shielding film is drawn by copper sheet window point
Cover film test point, which has been connected to electromagnetic shielding film, by multimeter measure this screened film test point and GND it
Between resistance value.
Further, point contact multitester probe is tested by the one or more exposed screened films of setting to be tested, lead to
It crosses and the windowed regions be connected with EMI is extended out, pass through the conducting between the measurement screened film test point to extend out and ground
Property, to measure EMI and earthing effect.
Present invention only requires one or more exposed test point contact test pencils to test；It is in fact exactly handle and EMI
The windowed regions of conducting extend out, and by the conduction between the measurement point to extend out and ground, imitate to measure EMI and ground connection
Fruit.
Detailed description of the invention
Fig. 1 is the electromagnetic shielding film earth impedance schematic structural diagram of testing device of monolithic FPC of the present invention；
Fig. 2 is another example structure schematic diagram of electromagnetic shielding film earth impedance test device of monolithic FPC of the present invention.
In figure: electromagnetic shielding film 1, vertical portion 2, horizontal part 3, concave part 4, the first cell wall 41, the second cell wall 42, screened film
Firing point 5, screened film test point 6, the first screened film test point 61, secondary shielding film test point 62.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to attached drawing 1-2: the electromagnetic shielding film earth impedance test device of monolithic FPC, including it is electromagnetic shielding film 1, perpendicular
Straight portion 2, horizontal part 3, concave part 4, screened film firing point 5, screened film test point 6.
The electromagnetic shielding film 1 of monolithic FPC includes vertical portion 2, horizontal part 3, and the right end of horizontal part 3 has concave part 4, groove
Portion 4 includes the first cell wall 41, the second cell wall 42, and the first cell wall 41, the second cell wall 42 are mutually perpendicular to, and screened film firing point 5 is located at
Within/on electromagnetic shielding film 1, screened film test point 6 is located in concave part 4, and screened film firing point 5 and screened film test point 6 are electrically
Connection.
The distance of 5 to the first cell wall 41 of screened film firing point is equidistant with 6 to the first cell wall 41 of screened film test point,
The distance of 6 to the first cell wall 41 of screened film test point is 0.35-0.40 times of 4 depth T of concave part, screened film test point 6 to the
The distance of two cell walls 42 is 0.95-1.0 times of 4 depth T of concave part.
Referring to attached drawing 2, screened film test point 6 includes the first screened film test point 61, secondary shielding film test point 62, and first
Screened film test point 61, secondary shielding film test point 62 are located on same vertical line, the first screened film test point 61, secondary shielding
Film test point 62 and 5 electrical communication of screened film firing point, the first screened film test point 61, secondary shielding film test point 62, shielding
The line form right angle triangle of 5 three of film firing point/be similar to right angled triangle.It is clicked through by the way that multiple screened film tests are arranged
One step improves the accuracy of measurement, validity.
Present invention only requires one or more exposed test point contact test pencils to test；It is in fact exactly handle and EMI
The windowed regions of conducting extend out, and by the conduction between the measurement point to extend out and ground, imitate to measure EMI and ground connection
Fruit.
Above embodiment is the description of the invention, is not limitation of the invention, it is possible to understand that is not departing from this hair
A variety of change, modification, replacement and modification, guarantor of the invention can be carried out to these embodiments in the case where bright principle and spirit
Shield range is defined by the appended claims and the equivalents thereof.
Claims (6)
1. the electromagnetic shielding film earth impedance test device of monolithic FPC a kind of comprising electromagnetic shielding film (1), vertical portion (2),
Horizontal part (3), concave part (4), screened film firing point (5), screened film test point (6), the electromagnetic shielding film of monolithic FPC include perpendicular
Straight portion, horizontal part, the right end of horizontal part have concave part, and concave part includes the first cell wall (41), the second cell wall (42), the first slot
Wall, the second cell wall are mutually perpendicular to, it is characterised in that: screened film firing point (5) is located in electromagnetic shielding film (1), screened film test
Point (6) is located in concave part (4), screened film firing point and screened film test point electrical property connection.
2. the electromagnetic shielding film earth impedance test device of monolithic FPC according to claim 1 a kind of, which is characterized in that
Screened film firing point to the first cell wall distance with screened film test point being equidistant to the first cell wall, screened film test point is extremely
The distance of first cell wall is 0.35-0.40 times of concave part depth (T).
3. the electromagnetic shielding film earth impedance test device of monolithic FPC according to claim 2 a kind of, which is characterized in that
The distance of screened film test point to the second cell wall is 0.95-1.0 times of concave part depth (T).
4. the electromagnetic shielding film earth impedance test device of monolithic FPC according to claim 1 a kind of, which is characterized in that
Screened film test point includes the first screened film test point (61), secondary shielding film test point (62), the first screened film test point, the
Two screened film test points are located on same vertical line, and the first screened film test point, secondary shielding film test point are connected with screened film
Point electrical communication, the first screened film test point, secondary shielding film test point, the line composition of screened film firing point three are similar to
Right angled triangle.
5. the electromagnetic shielding film earth impedance test device of monolithic FPC according to claim 4 a kind of, which is characterized in that
By increasing test circuit on monolithic FPC, the screened film test point of electromagnetic shielding film, the shielding are drawn by copper sheet window point
Film test point has been connected to electromagnetic shielding film, measures the resistance value between this screened film test point and GND by multimeter.
6. the electromagnetic shielding film earth impedance test device of monolithic FPC according to claim 5 a kind of, which is characterized in that
It tests point contact multitester probe by the one or more exposed screened films of setting to be tested, by opening what is be connected with EMI
Window region extends out, by the conduction between the measurement screened film test point to extend out and ground, to measure EMI and ground connection
Effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109188097A true CN109188097A (en) | 2019-01-11 |
| CN109188097B CN109188097B (en) | 2023-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811240491.1A Active 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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| CN (1) | CN109188097B (en) |
Citations (7)
| 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 |
-
2018
- 2018-10-24 CN CN201811240491.1A patent/CN109188097B/en active Active
Patent Citations (7)
| 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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| CN109188097B (en) | 2023-09-15 |
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