CN110794287A - A tool for detecting pressure injuries on circuit boards - Google Patents

Abstract

A pressure-wound detection tool for a circuit board, comprising a main body area, the main body area including a protective film layer, a wiring layer, a first base material layer, an upper conductive layer, a support isolation layer, a lower conductive layer that are stacked in sequence from top to bottom layer and the second substrate layer, the upper conductive layer is divided into a plurality of conductive units, and there is no conduction between any two conductive units, a plurality of wires are arranged in the wiring layer, and the first substrate layer is open There are a plurality of through holes, the wires and the through holes are respectively arranged in a one-to-one correspondence with the conductive units, and the wires are electrically connected with the conductive units along the through holes; one side of the main body area is provided with an observation area, and the A power supply and a plurality of indicator lights are installed in the observation area. The indicator lights are electrically connected to the wires and are arranged in one-to-one correspondence. The power supply is electrically connected to the plurality of indicator lights respectively, and the power supply is also electrically connected to the lower conductive layer. Compared with the prior art, compared with manual detection, the present invention can accurately and efficiently detect the pressure injury of the circuit board, and secondly, the detection accuracy is high.

Description

A tool for detecting pressure injuries on circuit boards

technical field

The invention relates to the technical field of PCB board manufacturing, in particular to a pressure-wound detection tool for circuit boards.

Background technique

In the ET test process of circuit board production, a special fixture supporting test machine needs to be used to test the circuit board for open and short circuit. The specific process is: put the circuit board on the PIN of the lower fixture → start the test machine → press the test machine press → Drive the fixture fixed under the press to press down → the test pin on the fixture is in contact with the corresponding measuring point pad → connect the electrical signal → the tester outputs the result after the test is completed → the press rises → takes the board → continues to the next cycle.

In the process of the test needle contacting the circuit board pad, the test needle is elastic under normal conditions and will not cause pressure damage to the copper surface of the pad. Foreign copper slag will cause the circuit board to be crushed. In view of this situation, the industry generally relies on random inspection and direct viewing with the eyes through a magnifying glass, but the efficiency is very low, and the circuit board becomes uneven due to surface ink, text and lines. , its color is also different, there is a great risk of omission by visual inspection alone.

Therefore, it is necessary to provide a new tool for detecting pressure damage on circuit boards to solve the above-mentioned technical problems.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a pressure-wound detection tool for circuit boards that can accurately detect, has high precision and high efficiency.

The technical solution adopted by the present invention to solve the technical problem is a pressure-wound detection tool for a circuit board, which includes a main body area, and the main body area includes a protective film layer, a wiring layer, and a first substrate that are stacked in sequence from top to bottom. layer, an upper conductive layer, a support isolation layer, a lower conductive layer and a second substrate layer, the upper conductive layer is divided into a plurality of conductive units, and there is no conduction between any two conductive units, and the wiring layer is provided with a plurality of conducting wires, the first base material layer is provided with a plurality of conducting holes, the conducting wires and the conducting holes are respectively arranged in a one-to-one correspondence with the conducting units, and the conducting wires are electrically connected with the conducting units along the conducting holes;

One side of the main body area is provided with an observation area, the observation area is provided with a power supply and a plurality of indicator lights, the indicator lights are electrically connected with the wires, and are arranged in a one-to-one correspondence, and the power supply is respectively electrically connected with the plurality of indicator lights, The power source is also electrically connected to the lower conductive layer.

Preferably, the support and isolation layer is provided with a pressure-sensitive adhesive and a plurality of ceramic microbeads, and the plurality of ceramic microbeads are embedded in the pressure-sensitive adhesive.

Preferably, supports are provided on both sides of the wire.

Preferably, the thicknesses of the upper conductive layer and the lower conductive layer are both 15-21um.

Preferably, the diameter of the ceramic microbeads is 10-20um.

Preferably, the thickness of the protective film layer is 20-30um.

Preferably, both the upper conductive layer and the lower conductive layer are made of copper.

Preferably, the protective film layer is made of PI film.

Preferably, the support is a filler.

Preferably, the material of the base material layer is FR-4.

Compared with the prior art, compared with manual detection, the present invention can quickly detect whether there is a pressure injury on the circuit board through the detection tool for pressure injury. i.e. accurate and efficient. When the circuit board is crushed, the indicator light connected to the corresponding conductive unit is on. The design can accurately reflect the crushed area, which is convenient for the operator to accurately find the crushed point, and the detection accuracy is high. Secondly, it can be used repeatedly. When the upper conductive layer and the lower conductive layer are in close contact with each other, just remove the pressure, and the upper conductive layer and the lower conductive layer can be separated under the elastic force of the ceramic beads to achieve the purpose of repeated detection.

Description of drawings

Fig. 1 is the structural representation of the present invention;

FIG. 2 is a schematic cross-sectional view of the main body region of the present invention.

In the picture:

1. Main body area, 2. Observation area, 11. Protective film layer, 12. Wiring layer, 13. First substrate layer, 14. Upper conductive layer, 15. Support isolation layer, 16. Lower conductive layer, 17. Section Two substrate layers, 121. Conductor, 122. Support, 131. Via hole, 141. Conductive unit, 151. Pressure sensitive adhesive, 152. Ceramic beads, 3. Power supply, 4. Indicator light.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Referring to Figures 1-2, the present embodiment is a pressure injury detection tool for a circuit board, including a main body area 1, and the main body area 1 includes a protective film layer 11, a wiring layer 12, a first The base material layer 13 , the upper conductive layer 14 , the support isolation layer 15 , the lower conductive layer 16 and the second base material layer 17 , the upper conductive layer 14 is divided into a plurality of conductive units 141 , and there is no conduction between any two conductive units 141 , the wiring layer 12 is provided with a plurality of wires 121, the first substrate layer 13 is provided with a plurality of via holes 131, the wires 121 and the via holes 131 are respectively arranged in a one-to-one correspondence with the conductive units 141, and the wires 121 are arranged along the via holes 131 is electrically connected to the conductive unit 141;

One side of the main body area 1 is provided with an observation area 2, the observation area 2 is equipped with a power supply 3 and a plurality of indicator lights 4, the indicator lights 4 are electrically connected with the wires 121, and are arranged in one-to-one correspondence, and the power supply 3 is respectively connected with a plurality of indicator lights 4. Electrically connected, the power supply 3 is also electrically connected to the lower conductive layer 16 . The conductive units 141 are arranged one-to-one with the wires 121 and the indicator lights 4 , so that it is convenient to quickly find out which area of the circuit board corresponding to the conductive units 141 has a pressure injury through the indicator lights 4 .

The support isolation layer 15 is provided with a pressure-sensitive adhesive 151 and a plurality of ceramic microbeads 152 , and the plurality of ceramic microbeads 152 are embedded in the pressure-sensitive adhesive 151 . The pressure-sensitive adhesive 151 has a sensitive response to pressure, the ceramic microbeads 152 have elasticity, and can separate the upper conductive layer 14 and the lower conductive layer 16, and the ceramic microbeads 152 have good self-wetting and fluidity, which is convenient for the upper conductive layer 14 and the lower conductive layer 16. The lower conductive layer 16 can respond quickly to localized excessive pressure. By arranging the pressure-sensitive adhesive 151 and the ceramic micro-beads 152, when pressing, if there is a pressure injury, when the local pressure is too large, the upper conductive layer 14 and the lower conductive layer 16 can be in close contact to conduct electricity. This design can quickly detect the circuit. Which area of the plate has the pressure injury. After the pressure is released, under the elastic force of the ceramic microbeads 152, the upper conductive layer 14 and the lower conductive layer 16 are separated and restored to the original state, and the pressure injury of the circuit board can be continuously detected.

Two sides of the wire 121 are provided with supports 122, and the supports 122 are filled with glue. By setting the filling glue, the wiring layer 12 can be made flat, so as to avoid affecting the use of the detection pressure tool.

The thicknesses of the upper conductive layer 14 and the lower conductive layer 16 are both 15-21um. By setting the thin upper conductive layer 14 and the lower conductive layer 16, it is easy to respond to local excessive pressure, and it is convenient to detect the pressure-wound area of the circuit board.

The diameter of the ceramic microbeads 152 is 10-20um. It is ensured that the upper conductive layer 14 and the lower conductive layer 16 are not in close contact under the influence of local excessive pressure, and the separation of the upper conductive layer 14 and the lower conductive layer 16 under the elastic force of the ceramic microbeads 152 is not affected after the pressure is released. and restored to its original state.

The thickness of the protective film layer 11 is 20-30um. By providing a thin protective film layer 11, it is easy to respond to pressure, and it is convenient to detect the pressure-wound area of the circuit board.

Both the upper conductive layer 14 and the lower conductive layer 16 are made of copper. Copper has good electrical conductivity, is not easily corroded, has low hardness, and is easy to respond to pressure.

The protective film layer 11 is made of a PI film.

The material of the base material layer is FR-4.

The working steps of the tool for detecting pressure injury on a circuit board provided by the present invention are as follows:

(1) When all the circuit boards that have been sampled have been tested, suspend the circuit board test, and put the tested circuit board on the PIN of the lower fixture;

(2) Power on the power supply 3 of the pressure injury detection tool. Before use, press any area with the tip of a pen or a test needle to simulate the pressure injury to test whether it can accurately measure the pressure injury. If not, check and repair the pressure injury. Tools allow it to accurately detect crush injuries.

(3) Flatten the detection tool for crush injury into the circuit board test area;

(4) Operate the testing machine, the press is lowered, and the fixture on the press is pressed to detect the crushing tool;

(5) If the circuit board is crushed, the corresponding indicator light 4 is on:

(6) If the indicator light 4 does not light up, release the press, move the tool to detect the pressure injury a little, and repeat the test again; there is a small gap between the conductive units to ensure that the conductive units are not conductive. Slightly move the detection tool for crushing and perform re-testing, which can avoid the failure of detection due to the fact that the crushed area of the circuit board just corresponds to the gap between the conductive units.

(7) If the indicator light 4 does not light up after the retest, it means that the circuit board is not crushed;

(8) Test other tested circuit boards according to the above steps.

The working principle of the pressure injury detection tool is as follows: put the pressure detection tool into the test area of the circuit board, and press the pressure detection tool. The conductive layer 16 is pressed and contacted to conduct, and the indicator light 4 corresponding to the conductive unit 141 will light up; otherwise, the circuit board has no pressure damage, and the overall pressure is balanced. The upper conductive layer 14 and the lower conductive layer 16 The beads 152 are isolated, not conducting, and the indicator light 4 is not on.

Compared with manual detection, the present invention can quickly detect whether there is a pressure injury on the circuit board through the detection tool for pressure injury. If there is a pressure injury, the indicator light 4 will be on, and if there is no pressure injury, the indicator light 4 will not be on. The detection method is accurate and efficient. , When the circuit board is crushed, the indicator light 4 connected to the corresponding conductive unit 141 is on. This design can accurately reflect the crushed area, which is convenient for the operator to accurately find the crushed point, and the detection accuracy is high. Secondly, it can be used repeatedly. When the upper conductive layer 14 and the lower conductive layer 16 are in close contact with each other, the upper conductive layer 14 and the lower conductive layer 16 can be separated under the elastic force of the ceramic microbeads 152 simply by removing the pressure, so as to achieve Purpose of repeat testing.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. The tool for detecting the crush injury of the circuit board is characterized by comprising a main body area, wherein the main body area comprises a protective film layer, a wiring layer, a first base material layer, an upper conducting layer, a supporting isolation layer, a lower conducting layer and a second base material layer which are sequentially laminated from top to bottom, the upper conducting layer is divided into a plurality of conducting units, any two conducting units are not conducting, a plurality of conducting wires are arranged in the wiring layer, a plurality of via holes are formed in the first base material layer, the conducting wires and the via holes are respectively arranged in one-to-one correspondence with the conducting units, and the conducting wires are electrically connected with the conducting units along the via holes;

one side in main part district is equipped with the observation district, power and a plurality of pilot lamp are installed to the observation district, and the pilot lamp is connected with the wire electricity, and the one-to-one setting, the power is connected with a plurality of pilot lamp electricity respectively, the power still with down the conducting layer electricity be connected.

2. The tool for detecting crush damage of a circuit board as claimed in claim 1, wherein the support spacer layer is provided with a pressure sensitive adhesive and a plurality of ceramic micro beads embedded in the pressure sensitive adhesive.

3. The tool of claim 2, wherein the wire is supported on both sides of the wire.

4. The tool of claim 3, wherein the upper and lower conductive layers are each 15-21um thick.

5. The tool for detecting crush damage of circuit board according to claim 4, wherein the ceramic micro beads have a diameter of 10-20 um.

6. The tool of claim 5, wherein the thickness of the protective film layer is 20-30 um.

7. The tool of claim 6, wherein the upper and lower conductive layers are each made of copper.

8. The tool of claim 7, wherein the protective film is made of PI film.

9. The tool of claim 8, wherein the support is an underfill.

10. The tool of claim 9, wherein the substrate layer is made of FR-4.

Images