The LED heat dissipation substrate circuit must be printed on both sides. Due to the arrangement of the LED array, even the same plane circuit is usually not completed in one printing. At the same time, in order to reduce the interface contact resistance, this must inevitably require high positioning printing accuracy. There are 5 × 4 arrays with mutually perpendicular crosses, and (1 + 2 + 3 + 4) × 4 arrays with concentric circles.
There are of course more than one way to achieve this circuit wiring. The most effective application should be layered wiring multiple printing, each arrangement is printed one layer at a time, so that accurate positioning is required between each layer of circuits.
For accurate alignment, of course, laser programming can be used to position a high-precision printing machine, but such a cost is very high, and the printing efficiency is not high. Therefore, in actual production, a general printing machine with a common imaging system is often used. In this case, How to design a registration system to achieve high-speed and high-precision printing, and design a test system for equal-line alignment, equal-triangle alignment, and equal-corner alignment.
The two alignments of the straight line alignment are radial T characters passing through the center of the circle;
The triangular alignment is also T-shaped. The first alignment of the molecular beam extension is a median perpendicular to the alignment of the straight line, and the other two alignments are the third and fourth quadrants. Place on the same circle and divide the circle equally;
The four corner alignments are Γ characters, and the four alignments are bisected diagonal lines of 4 quadrants, respectively, and the four alignment Γ characters are connected into a square.
Standard Recovery Stud Diode are mainly used for rectifying and switching
It has positive pressure reduction (0.4v -- 1.0v), short reverse recovery time (2-10ns nanosecond), large reverse leakage current, low pressure resistance, generally lower than 150V, and is used in low voltage situations.
Diodes are electronic devices that have two electrodes that allow only a single current to flow in a single direction.Varicap bond (bond) is an electronic adjustable capacitor.Most diodes have a current orientation that we call reading "rectifier".The most common function of a diode is to allow only the current to pass in one direction (called forward bias) and to block in the opposite direction (called reverse bias).
Standard Recovery Stud Diode,Standard Recovery Diode,400V Standard Recovery Diode,Stud Diode
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