TWM653017U - PCB testing fixture - Google Patents

Abstract

A printed circuit board test fixture is used to solve the problem of difficult alignment of conventional printed circuit board test fixtures. The system includes: a substrate located between an electrical testing machine and a circuit board to be tested, the top of the substrate being coupled and fixed to the electrical testing machine; a testing portion located at the bottom of the substrate and opposite to the circuit board to be tested Several test points; and a positioning opening that penetrates from the top surface to the bottom surface of the substrate, and the position of the positioning opening corresponds to a mounting part of the circuit board to be tested, and each side of the mounting part is translated outward by one The expansion width is the boundary of the positioning opening, and the circuit board to be tested has at least one positioning mark located outside the mounting part and within the range of the positioning opening. This can achieve functions such as accurate alignment and sharing of test fixtures.

Description

Printed Circuit Board Test Fixture

This invention relates to an auxiliary device for the printed circuit board manufacturing process, especially a printed circuit board test fixture that is accurately aligned and used for various circuit patterns.

Please refer to Figure 1, which is a conventional printed circuit board testing fixture 9. During the electrical testing process, the printed circuit board testing fixture 9 is located between the electrical testing machine and a circuit board B to be tested. , The test probe P of the electrical testing machine penetrates the printed circuit board test fixture 9 to contact and measure the underlying circuit board B to be tested. The printed circuit board test fixture 9 has at least one photography window 91, The at least one photography window 91 is aligned with the transmission part on the left or right side of the circuit board B to be tested, so that the image unit of the electrical testing machine can capture the transmission holes and the corresponding parts of the transmission part through the at least one photography window 91 The image of the bit mark M can be used to calibrate the position of the test probe P, so that the electrical properties of the circuit board circuit can be accurately measured.

However, the circuit boards B to be tested used for different products may have circuit patterns of different sizes and shapes, so the alignment mark M must be adjusted according to the distribution of the circuit patterns. Therefore, each time the circuit board B to be tested for a different product is replaced, the electrical tester needs to reposition the alignment mark M before the test can be performed. If the position of the alignment mark M exceeds the range of the photographic window 91 of the printed circuit board test fixture 9, the imaging unit of the electrical tester cannot successfully obtain the image of the alignment mark M, and the printed circuit board test fixture 9 must be replaced, resulting in a delay in the test work. In addition, preparing various test fixtures corresponding to different circuit boards B to be tested will result in a waste of resources and increase in production costs.

In view of this, there is still a need to improve the conventional printed circuit board test fixture.

To solve the above problems, the purpose of this invention is to provide a printed circuit board test fixture that can be used to test circuit board products with various circuit patterns.

The secondary purpose of this invention is to provide a printed circuit board test fixture that can improve test efficiency and accuracy.

Another purpose of the present invention is to provide a printed circuit board test fixture that can save the cost of making various fixtures.

The directions or similar terms described in the entire text of this creation, such as "left", "right", "up (top)", "down (bottom)", "inside", "outside", "side", etc., are mainly used to refer to the directions of the attached drawings. Each direction or its similar terms are only used to assist in the description and understanding of the various embodiments of this creation, and are not used to limit this creation.

The quantifiers "a" or "an" used in the elements and components described throughout this invention are only for convenience of use and to provide a general meaning of the scope of this invention; they should be interpreted in this invention as including one or at least one, and the concept of a single number also includes the plural case, unless it is obvious that it means otherwise.

The printed circuit board test fixture of the invention comprises: a substrate, located between an electrical tester and a circuit board to be tested, the top of the substrate being fixedly coupled to the electrical tester; a test portion, located at the bottom of the substrate and opposite to a plurality of test points of the circuit board to be tested; and a positioning opening, penetrating from the top surface of the substrate to the bottom surface, and the position of the positioning opening corresponds to a mounting portion of the circuit board to be tested, each side of the mounting portion being translated outwardly by an expansion width equal to the boundary of the positioning opening, and the circuit board to be tested has at least one alignment mark located outside the mounting portion and within the range of the positioning opening.

Accordingly, the printed circuit board test fixture of the present invention can quickly and accurately locate the circuit board to be tested for electrical testing by capturing the alignment marks around the mounting portion of the circuit board to be tested through the positioning opening with an expanded search range. In addition, circuit board products with different circuit patterns can share the test fixture to search for alignment marks and locate smoothly, which has the effect of reducing the cost of preparing the fixture and saving the time of replacing the fixture.

The electrical tester has several test probes that penetrate the substrate and are exposed in the test section. The test probes contact and test the test points respectively. In this way, the test probes can be correctly aligned with the test points to test the short circuit and open circuit states of the circuits and the electrical parameters of the electronic components respectively, which has the effect of improving the test efficiency and accuracy.

Wherein, the expansion width of the positioning opening is 2-4 mm. In this way, through the positioning opening, the entire area of the mounting part and the circuit patterns around it can be observed. For the circuit patterns of various circuit board products, alignment marks at different positions can still be searched. This is because there is a common test fixture. effect.

Among them, an imaging unit of the electrical tester shoots the circuit board to be tested located below the substrate through the positioning opening downward, and the field of view of the imaging unit includes the mounting portion, the circuit pattern around the mounting portion, and the at least one alignment mark. In this way, the image captured by the imaging unit can be used to determine whether the circuit board to be tested is moved to the correct test position, which has the effect of improving the test alignment efficiency.

Wherein, the material of the at least alignment mark and the circuit pattern is conductive metal. In this way, alignment marks can be produced at the same time when manufacturing conductive circuits, and metal materials are relatively easy to detect and identify, which has the effect of simplifying the manufacturing process and assisting in test alignment.

The contour of the at least one alignment mark is approximately a triangle, and a width of the at least one alignment mark is the height or side length of the triangle, and the width is 0.25-0.3 mm. In this way, the triangle can be distinguished from the surrounding long strip-shaped conductive lines and square or round welding points, which has the effect of avoiding recognition errors.

The at least one alignment mark has an arc edge, so that the arc edge can match the surrounding circuit pattern or installation position, thereby having the effect of avoiding recognition errors.

The at least one alignment mark has an outer frame, and the inner part of the outer frame is the mark body and a filling pattern. Thus, the outer frame is used to protect the mark from being damaged by etching or cleaning, and the filling pattern is used to fill the vacancy of the circuit pattern, which has the effect of protecting the shape of the mark.

The outline of the outer frame is approximately a triangle. In this way, the outer frame can match the surrounding circuit patterns and differentiate the shape, which has the effect of improving recognition and protecting marks.

Wherein, the outline of the outer frame is approximately a trapezoid. In this way, the outer frame can match the surrounding circuit patterns and differentiate the shape, which has the effect of improving recognition and protecting marks.

Wherein, the outline of the outer frame is approximately a quadrilateral. In this way, the outer frame can match the surrounding circuit patterns and differentiate the shape, which has the effect of improving recognition and protecting marks.

Wherein, the outer frame has at least one arc edge corresponding to the boundary of the installation part. In this way, the outer frame can match the contour of the installation part and has the function of protecting the mark and surrounding circuits.

The outer frame has at least one inner right angle corresponding to the right angle boundary of the mounting portion. Thus, the outer frame can match the outline of the mounting portion and has the function of protecting the mark and surrounding circuits.

In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following is a preferred embodiment of the present invention and a detailed description with accompanying drawings; in addition, the same symbols are marked in different drawings. are considered to be the same and their description will be omitted.

Please refer to Figure 2, which is a preferred embodiment of the printed circuit board test fixture of the present invention. It includes a substrate 1, a test portion 2 and a positioning opening 3. The substrate 1 is located in an electrical test Between the machine and a circuit board B to be tested, the test portion 2 is located at the bottom of the substrate 1 and relative to the circuit board B to be tested. The positioning opening 3 penetrates from the top surface of the substrate 1 to the bottom surface.

The top of the substrate 1 is fixedly coupled to the electrical tester, and the bottom of the substrate 1 is configured according to the size, pattern and test point position of the circuit board B to be tested. For example, the length and width of the substrate 1 are preferably slightly larger than the circuit pattern range of the circuit board B to be tested, and the central part of the substrate 1 is preferably aligned with a mounting portion S of the circuit board B to be tested, wherein the mounting portion S is used to mount electronic components, and the mounting portion S is surrounded by a plurality of conductive lines C on the circuit board B to be tested, so that the pins of the electronic components can be electrically connected to the plurality of conductive lines C at the mounting portion S. The electronic components can be operated by energizing the plurality of conductive lines C, and the electrical function of the electronic components can also be tested through the plurality of conductive lines C. During the test process, a plurality of the circuit boards B to be tested are aligned with the substrate 1 in sequence to be measured by the electrical tester.

The position of the test section 2 corresponds to a plurality of test points T on the circuit board B to be tested, and the plurality of test points T may be the ends of the plurality of conductive lines C. As shown in FIG. 2 , the plurality of conductive lines C may extend upward or downward from the mounting portion S to the edge of the circuit board B to be tested, so that the plurality of test points T are arranged at the upper edge and the lower edge of the circuit board B to be tested, respectively. Then, the test section 2 is located at the upper and lower sides of the bottom surface of the substrate 1 corresponding to the plurality of test points T. In this way, by testing the plurality of test points T distributed on the outer side of the circuit board B to be tested, damage to the circuit pattern in the center of the circuit board B to be tested may be reduced.

The several test probes of the electrical tester penetrate the substrate 1 and are exposed at the test part 2. When the circuit board B to be tested is moved to be positioned and aligned with the substrate 1, the several test probes can be correctly aligned and contact the several test points T through the test part 2 to respectively test the short circuit, open circuit status of the several conductive lines C or the electrical parameters of the installed electronic components.

The position of the positioning opening 3 corresponds to the mounting part S of the circuit board B to be tested. As shown in Figure 2, the area of the positioning opening 3 is larger than the mounting part S. Through the positioning opening 3, it can be Look down at the circuit board to be tested B located under the substrate 1, and observe the entire area of the mounting portion S and the circuit pattern around it. The boundary of the positioning opening 3 can be determined by the four sides of the mounting portion S. Expand outwards upward, downward, left, and right respectively. Specifically, each side of the mounting portion S is translated outward by an expansion width E to become the boundary of the positioning opening 3. The expansion width E can be 2 to 4 mm, preferably 3 mm.

Please refer to Figures 2 and 3. The circuit board B to be tested has at least one alignment mark M. The electrical tester can confirm whether the circuit board B to be tested has been moved to a position by identifying the position of the at least one alignment mark M, so that the test section 2 can be aligned with the plurality of test points T to accurately perform the test. Specifically, the at least one alignment mark M is located outside the mounting section S and within the range of the positioning opening 3. When an imaging unit of the electrical tester photographs the circuit board B to be tested below the substrate 1 from top to bottom through the positioning opening 3, it can capture the image of the mounting section S, the circuit pattern around the mounting section S, and the at least one alignment mark M. The image can be used to determine whether the circuit board B to be tested has been moved to a correct test position. The material of the at least one alignment mark M is preferably the same conductive metal as the surrounding conductive lines.

Please refer to Figures 3 to 6. The outline of the at least alignment mark M is preferably similar to a triangle, which can be separated from the surrounding strip-shaped conductive lines and square or circular welding points, and has the ability to avoid Identify the role of errors. A width W of the at least one alignment mark M may be the height or side length of the triangle, and the width W may be 0.25 to 0.3 mm. In addition, the at least one alignment mark M may include at least one arc edge to match the surrounding Depending on the circuit pattern or installation location, the radius of curvature of the arc edge may be 2 mm. The at least alignment mark M may also include an outer frame for protecting the integrity of the mark's shape and reducing damage from etching or cleaning. As shown in Figure 3, the outline of the outer frame is a triangle similar to the internal mark body. The frame can highlight the mark and be easily recognized. The outer frame can also be of other shapes; as shown in Figure 4, the outline of the outer frame is approximately a trapezoid, and the hypotenuse of the trapezoid forms an arc to match the mounting portion S The boundary; as shown in Figure 5, the outline of the outer frame is approximately a quadrilateral and contains at least two hypotenuses. In addition to the triangle marks for identification, the area enclosed by the outer frame can also form a filling pattern for filling lines. There are gaps in the pattern to protect adjacent marks; as shown in Figure 6, when the boundary shape of the mounting part S is a right angle, the outline of the outer frame can also form an inner right angle to replace the original arc edge to correspond to the mounting part S. Boundary of S. However, the shape and outer frame type of the at least alignment mark M of this invention are not limited to the above embodiment.

In summary, the printed circuit board test fixture of the present invention can quickly and accurately locate the circuit board to be tested for electrical testing by capturing the alignment marks around the mounting portion of the circuit board to be tested through the positioning opening with an expanded search range. In addition, circuit board products with different circuit patterns can share the test fixture to search for alignment marks and locate smoothly, which has the effect of reducing the cost of preparing the fixture and saving the time of replacing the fixture.

Although the present invention has been disclosed using the above-mentioned preferred embodiments, they are not intended to limit the present invention. Any person skilled in the art may make various changes and modifications to the above-mentioned embodiments without departing from the spirit and scope of the present invention, and these changes and modifications are still within the technical scope protected by the present invention. Therefore, the protection scope of the present invention shall include all changes within the meaning and equivalent scope recorded in the attached patent application scope.

﹝Original creation﹞ 1: Substrate 2: Test section 3: Positioning opening B: Circuit board to be tested S: Mounting section C: Conductive line T: Test point E: Expansion width M: Alignment mark W: Width ﹝Practice﹞ 9: Printed circuit board test fixture 91: Photo window B: Circuit board to be tested P: Test probe M: Alignment mark

[Figure 1] A diagram showing a use of a known printed circuit board test fixture. [Figure 2] A top view of a preferred embodiment of the invention. [Figure 3] An enlarged view of the alignment mark of region A shown in Figure 2. [Figure 4] Another embodiment of the alignment mark shown in Figure 3. [Figure 5] Another embodiment of the alignment mark shown in Figure 3. [Figure 6] Another embodiment of the alignment mark shown in Figure 3.

1:Substrate

2: Testing Department

3: Positioning holes

B: Circuit board to be tested

S: Installation Department

C: Conductive lines

T: test point

E: Expand width

M: Counterpoint mark

Claims (13)

A printed circuit board test fixture comprises: a substrate, located between an electrical tester and a circuit board to be tested, the top of the substrate being fixedly coupled to the electrical tester; a test portion, located at the bottom of the substrate and opposite to a plurality of test points of the circuit board to be tested; and a positioning opening, penetrating from the top surface of the substrate to the bottom surface, and the position of the positioning opening corresponds to a mounting portion of the circuit board to be tested, each side of the mounting portion is translated outwardly by an expansion width as the boundary of the positioning opening, and the circuit board to be tested has at least one alignment mark located outside the mounting portion and within the range of the positioning opening. As in claim 1, a printed circuit board test fixture, wherein a plurality of test probes of the electrical test machine penetrate the substrate and are exposed at the test portion, and the plurality of test probes contact and test the plurality of test points respectively. For example, the printed circuit board test fixture of claim 1, wherein the expansion width of the positioning opening is 2 to 4 mm. A printed circuit board test fixture as claimed in claim 1, wherein an imaging unit of the electrical test machine photographs the circuit board to be tested located below the substrate downward through the positioning opening, and the field of view of the imaging unit includes the mounting portion, the circuit pattern around the mounting portion, and the at least one alignment mark. A printed circuit board test fixture as claimed in claim 4, wherein the material of the at least one alignment mark and the circuit pattern is a conductive metal. A printed circuit board test fixture as claimed in claim 4, wherein the outline of the at least one alignment mark is approximately a triangle, a width of the at least one alignment mark is the height or side length of the triangle, and the width is 0.25 to 0.3 mm. The printed circuit board test fixture of claim 6, wherein the at least one alignment mark has an arc edge. The printed circuit board test fixture of claim 4, wherein the at least one alignment mark further has an outer frame, and inside the outer frame are the mark body and a filling pattern. The printed circuit board test fixture of claim 8, wherein the outline of the outer frame is approximately a triangle. The printed circuit board test fixture of claim 8, wherein the outline of the outer frame is approximately a trapezoid. The printed circuit board test fixture of claim 8, wherein the outline of the outer frame is approximately a quadrilateral. The printed circuit board test fixture of any one of claims 9 to 11, wherein the outer frame has at least one arc edge corresponding to the boundary of the mounting part. The printed circuit board test fixture of any one of claims 9 to 11, wherein the outer frame has at least one inner right angle corresponding to the right angle boundary of the mounting part.

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