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Mark point design in PCB production


May 23, 2022
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1. The PCB must have a Mark point corresponding to the positioning of the entire board on the diagonal of the long side of the board.

Chips with an IC pin center distance of less than 0.65mm on FS Technology’s circuit boards should have a Mark point corresponding to the chip positioning on the diagonal of the long side of the IC; when there are patches on both sides of the pcb, both sides of the pcb should be Add Mark points based on this article.

2. The edge of the PCB should retain the 5mm process edge (the minimum spacing requirement for the machine to clamp the PCB).

Chips whose center-to-center distance between IC pins is less than 0.65mm should be greater than 13mm from the edge of the board (including the edge of the process); the four corners of the board should be chamfered with a φ5 arc. Judging from the current bending degree of PCB wings, the optimal splicing length is about 200mm (equipment processing size: maximum length is 330mm; maximum width is 250mm), try not to spell in the width direction to prevent bending during production.

3. MARK point functions and categories.

Mark points, also known as fiducials, provide a common measurable point for all steps in the assembly process to ensure that each assembly device can accurately locate the circuit pattern. Therefore, FS Technology believes that the Mark point is crucial for SMT production.

4. MARK point design specification recommended by our department.

1) Shape: It is recommended to mark the Mark point as a diameter: R=1.0mm solid circle;
2) Form a complete MARK point, including marked points (or feature points) and open areas.
3) Position: The Mark point is located at the relative position of the diagonal on the veneer or puzzle, and is separated as much as possible; it is best to distribute it at the longest diagonal position (such as the MARK point position diagram).
4) In order to ensure the installation accuracy requirements of FS Technology, SMT requirements: each PCB must have at least one pair of MARK points for the SMT machine to identify, and there must be a single-board MARK (when assembling).
Panel MARK or combined MARK only play a role of auxiliary positioning.
5) When assembling, the relative positions of the MARK points of each single board must be the same.
The position of the MARK point cannot be moved for any reason, resulting in asymmetrical position of the MARK point of each board;
6) All MARK points on the PCB are only valid: two MARKs appearing in pairs on the same diagonal are valid.
So MARK points must appear in pairs to be used (MARK point location map).

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7) The distance between the MARK point (edge of the open area) and the edge of the PCB must be ≥5.0mm (minimum spacing requirements for the machine to clamp the PCB)

8) Requirements for open areas.

Around the mark point marking, there must be an open area with no other circuit features or markings.
The radius of the circle in the open area is R≥2R, where R is the radius of the MARK point.
When R reaches 3R, the machine recognition effect is better.

9) PBC Materials

Mark point markings can be bare copper, which is protected by a transparent anti-oxidant coating. If solder mask (solder mask) is used, the mark point or its open area should not be covered.

10) PBC Contrast.

A. The best identification performance is achieved when there is a high contrast between the mark point markings and the matrix material of the printed board.
B. The internal background must be the same for all mark points.
MARK classification:
1) Mark points are used for solder paste printing and component placement optical positioning.
According to the function of Mark points on the PCB, it can be divided into panel Mark points, single-board Mark points, local Mark points (also known as device-level Mark points),
2) There should be at least three Mark points on the edge of the FS technology paneling process and the veneer that does not need paneling, distributed in an L shape, and the diagonal Mark points are asymmetrical about the center.
3) If there are mounted components on both sides, then there must be mark points on each side.
4) There should be mark points on the board that needs to be assembled as much as possible. If there is no place to place the mark point, the mark point cannot be placed on the board.
5) For QFP with lead center distance ≤ 0.5mm and BGA equipment with center distance ≤ 0.8mm, the local Mark point should be set near the diagonal of the component center point for accurate positioning.
6) If several SOP devices are relatively close (≤100 mm) to form an array, they can be regarded as a whole, and two local Mark points are designed at their diagonal positions.
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