Method for improving recognition rate of CCD target alignment on the rear carrier of laser target burning

Abstract

The present invention relates to the field of chip image recognition technology, and specifically to a method for improving the recognition rate of the CCD target alignment of a carrier board after laser target burning. The present invention includes the following steps: S1, coating and protecting the core board: coating the coating area of the core board with ink to protect the recognition area of the CCD; S2, grinding and roughening the core board: grinding and roughening the roughened area of the core board to improve the tightness of the pressing with the matching board; S3, protection of the laser target: laser burning the target in the coating area of the core board to form a target after removing the ink; S4, CCD recognition of the target: using the relative dark area and relative bright area of the target recognized by the CCD to improve the recognition rate. The present invention indirectly improves the contrast of the target after coating the target with ink, thereby improving the target recognition rate of the carrier board CCD from 95% to 100%.

Description

Technical Field

[0001] The present invention relates to the technical field of chip image recognition, and in particular to a method for improving the recognition rate of CCD target alignment on a carrier plate after laser target burning. Background Art

[0002] In the current industry, to ensure the alignment accuracy of laser drilling and graphics, the target must be captured for alignment during both board surface laser drilling and graphic exposure. Typically, the CCD target capture requires a clear contrast between light and dark for successful capture. In the binary image captured by the CCD, areas with strong light reflection are bright, while areas with weak light reflection are dark. The target is generally designed as a central target circle. There are two types of binary images of the central target circle, with the target circle having a bright and dark area. The existing target design uses the lower resin pattern after laser burning the target as the target circle, with the resin as the bright area and the roughened copper foil as the dark area. This design can affect target recognition due to two situations: one is that there is drill contamination left on the bottom of the target after laser burning, which affects the brightness of the resin; the other is that because the laser burning target attacks the roughened copper surface below, there is a probability that bright spots will appear on the roughened copper foil, affecting the darkness of the copper foil surface. Both of these situations will reduce the black-and-white contrast of the target captured by the CCD. Therefore, to ensure CCD recognition of the target, in the first case, the resin drill residue on the copper foil surface during laser burning is removed through a de-drilling line to increase the resin brightness; in the second case, the copper surface is blackened to increase the darkness of the copper foil surface. After the de-drilling and blackening treatment, the target resin is the bright area when the CCD captures it, and the blackened copper foil is the dark area. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing technology and provide a method for improving the recognition rate of the CCD target alignment of the carrier board after laser burning the target, and to coat the target with ink before roughening the copper foil of the core board layer, thereby indirectly improving the contrast of the target.

[0004] The technical solution of the present invention is:

[0005] A method for improving the recognition rate of CCD target alignment on a carrier plate after laser target burning, comprising the following steps:

[0006] S1. Core board coating protection: Apply ink to the coating area of the core board to protect the CCD recognition area;

[0007] S2. Grinding and roughening of the core plate: Grinding and roughening the roughened area of the core plate to improve the tightness of the press fit with the matching plate;

[0008] S3. Protection of laser burning target: laser burning target in the coating area of the core board is used to form a target after removing the ink;

[0009] S4. CCD recognition of targets: The relative dark areas and relative bright areas of the target identified by CCD are used to improve the recognition rate.

[0010] Preferably, in step S1, the coating area includes a middle groove and a copper foil platform; the middle groove is resin, and the copper foil platform is a portion of the upper surface of the copper foil.

[0011] Preferably, in step S2, the roughened area is the roughened layer of the copper foil not coated with ink, that is, the outermost annular edge of the copper foil.

[0012] Preferably, in steps S3 and S4, the range of the target is consistent with the coating area, the relatively dark area corresponds to the middle groove, and the relatively bright area corresponds to the copper foil platform.

[0013] Preferably, the entire process of laser target burning is divided into the following stages:

[0014] Core board stage: the core board is made, and the core board includes copper foil, resin, and copper foil from bottom to top;

[0015] Fenestration stage: There is a target round window etching fenestration;

[0016] Coating stage: the coating area of the core board is coated and protected;

[0017] Roughening stage: the roughened area of the core board is ground and roughened;

[0018] Panel matching stage: preparation for pressing, panel matching according to pressing structure;

[0019] Lamination stage: resin and copper foil are cured and laminated;

[0020] Blackening stage: copper foil blackening;

[0021] Laser stage: The laser exposes the target, forming relatively dark areas and relatively bright areas.

[0022] Preferably, step S1 occurs in the coating stage, step S2 occurs in the roughening stage, and step S3 occurs in the laser stage.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) Reduce production costs: Add a coating stage between the window opening stage and the roughening stage. The coating ink uses a fast-curing ink that is not easy to produce volatiles. The processing time is short, and the drilling stage and blackening stage after the later laser stage are omitted, thereby increasing the product flow rate;

[0025] (2) Improve the CCD target recognition rate: After the target is coated with ink, the contrast of the target is indirectly improved, thereby increasing the target recognition rate of the carrier CCD from 95% to 100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 It is a flow principle block diagram of the present invention.

[0028] Figure 2 It is a complete set of process stage diagrams of the prior art.

[0029] Figure 3 It is a complete set of process stage diagrams of the present invention.

[0030] Figure 4 It is a structural schematic diagram of the present invention.

[0031] Figure 5 It is a structural schematic diagram of the coating area.

[0032] Figure 6 It is a structural diagram of the coarsening area.

[0033] Figure 7 It is a schematic diagram of the target structure.

[0034] Figure 8 This is a microscope image of the target recognized by the CCD.

[0035] In the figure: 1, resin; 2, copper foil; 3, coating area; 31, middle groove; 32, copper foil platform; 4, roughening area; 41, roughening layer; 5, target; 51, relatively dark area; 52, relatively bright area. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figure 1 As shown, this embodiment provides a method for improving the recognition rate of CCD target alignment on a carrier plate after laser target burning, comprising the following steps:

[0039] S1. Coating protection of core board: ink is applied to coating area 3 of the core board to protect the recognition area of the CCD;

[0040] S2. Grinding and roughening the core plate: Grind and roughen the core plate in the roughened area 4 to improve the tightness of the press fit with the matching plate;

[0041] S3, protection of laser target: laser target is burned in the coating area 3 of the core board to form target 5 after removing the ink;

[0042] S4. CCD recognition of the target: The relatively dark area 51 and the relatively bright area 52 of the target 5 recognized by the CCD are used to improve the recognition rate.

[0043] Example 2

[0044] Based on Example 1, the entire process of laser target burning is divided into the following stages:

[0045] Core board stage: The core board is made, and the core board includes copper foil 2, resin 1, copper foil 2 from bottom to top, such as Figure 3 As shown;

[0046] Windowing stage: 5 round windows are etched on the target;

[0047] Coating stage: coating area 3 of the core board is coated for protection;

[0048] Roughening stage: the core plate's roughened area 4 is ground and roughened;

[0049] Panel matching stage: preparation for pressing, panel matching according to pressing structure;

[0050] Lamination stage: resin 1 and copper foil 2 are cured and laminated;

[0051] Blackening stage: copper foil 2 blackening;

[0052] Laser stage: The laser exposes the target 5 to form a relatively dark area 51 and a relatively bright area 52.

[0053] It should be noted that the core board mentioned in the present invention includes a multi-layer structure in addition to the traditional two-layer structure.

[0054] like Figure 2 As shown, the whole set of process stages in the existing technology is divided into: core board stage, window opening stage, roughening stage, board matching stage, pressing stage, blackening stage, laser stage, drilling stage and blackening stage. Figure 3 As shown, the present invention adds a coating stage between the window opening stage and the roughening stage. The coating ink uses an ink that cures quickly and is not easy to produce volatiles. The processing time is short, and the two stages of drilling and blackening after the later laser stage are omitted, thereby reducing production costs and increasing product flow rate. Step S1 occurs in the coating stage, step S2 occurs in the roughening stage, and step S3 occurs in the laser stage.

[0055] Example 3

[0056] On the basis of Example 1, Figure 5 As shown, the coating area 3 includes a middle groove 31 and a copper foil platform 32; the middle groove 31 is the resin 1, and the copper foil platform 32 is part of the upper surface of the copper foil 2. Figure 6 As shown, the roughened area 4 is the roughened layer 41 of the copper foil 2 that is not coated with ink, that is, the outermost annular edge of the copper foil 2. Figure 7 As shown, the range of the target 5 is consistent with the coating area 3 , the relatively dark area 51 corresponds to the middle groove 31 , and the relatively bright area 52 corresponds to the copper foil platform 32 .

[0057] like Figure 8 As shown, the laser target microscope image and CCD capture binary images are designed using the laser target process and coated with ink and other protective methods to cover the target 5 layer. The ink coating indirectly improves the contrast between the relatively dark area 51 and the relatively bright area 52 of the target 5, thereby increasing the target 5 recognition rate of the carrier CCD from 95% to 100%.

[0058] Although the present invention has been described in detail with reference to the accompanying drawings and in combination with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who is familiar with the present invention may easily conceive of changes or substitutions within the technical scope disclosed in the present invention, and such changes or substitutions shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for improving the recognition rate of CCD target alignment on a carrier board after laser target burning, characterized in that: The steps include: S1. Coating protection of core board: coating ink on the coating area (3) of the core board to protect the recognition area of CCD; S2. Grinding and roughening the core plate: Grinding and roughening the roughened area (4) of the core plate to improve the tightness of the press fit with the matching plate; S3. Protection of laser target: laser target is burned in the coating area (3) of the core board to form a target (5) after removing the ink; S4. CCD recognition of the target: using the CCD to recognize the relatively dark area (51) and the relatively bright area (52) of the target (5) to improve the recognition rate.

2. The method for improving the recognition rate of CCD target alignment on the rear carrier of laser target burning as claimed in claim 1, characterized in that: In step S1, the coating area (3) includes a central groove (31) and a copper foil platform (32); the central groove (31) is the resin (1), and the copper foil platform (32) is a portion of the upper surface of the copper foil (2).

3. The method for improving the recognition rate of CCD target alignment on the rear carrier of laser target burning as claimed in claim 2, characterized in that: In step S2, the roughened area (4) is the roughened layer (41) of the copper foil (2) not coated with ink, that is, the outermost annular edge of the copper foil (2).

4. The method for improving the recognition rate of CCD target alignment on the rear carrier of laser target burning as claimed in claim 3, characterized in that: In steps S3 and S4, the range of the target (5) is consistent with the coating area (3), the relatively dark area (51) corresponds to the middle groove (31), and the relatively bright area (52) corresponds to the copper foil platform (32).

5. The method for improving the recognition rate of CCD target alignment on the rear carrier of laser target burning according to claim 1 or 3, characterized in that: The whole process of laser target burning is divided into: Core board stage: a core board is made, and the core board includes copper foil (2), resin (1), and copper foil (2) from bottom to top; Windowing stage: Windowing with target (5) round window etching; Coating stage: the coating area of the core board (3) is coated for protection; Roughening stage: The roughened area (4) of the core plate is ground and roughened; Panel matching stage: preparation for pressing, panel matching according to pressing structure; Lamination stage: the resin (1) and the copper foil (2) are cured and laminated; Blackening stage: copper foil (2) blackening; Laser stage: The laser exposes the target (5), forming a relatively dark area (51) and a relatively bright area (52).

6. The method for improving the recognition rate of CCD target alignment on the rear carrier of laser target burning as claimed in claim 5, characterized in that: The step S1 occurs in the coating stage, the step S2 occurs in the roughening stage, and the step S3 occurs in the laser stage.

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