Even if they sell hundreds of thousands or even millions of products, many companies will also engrave their own trademarks on each product they have sold. The damage to the marking of the trademark is done by the laser marking machine, which requires very high precision. With the advancement of technology, in order to make a more fine marking, the designers of these systems face more accurate pressure of laser marking machines.
Use high-strength, low-power laser laser marking machine (Figure 1) to etch very accurately in anything, such as mobile phones, hand tools, printed circuit boards (PCBs). In order to achieve the desired output, it is necessary to guide the laser with a precise digital-to-analog converter (DAC).
So how do DAC controls the laser? DAC is responsible for providing a very accurate output voltage that will be used as analog input of the motor. Each specific analog input code of the DAC is related to a particular motor location. This motor is responsible for moving the mirror, which can be reset on the X, Y or Z plane to guide and reflect the laser, and determine it on the terminal device to change the surface of the terminal device and etch the logos, text or barcodes. See Figure 2.
As you need to etch, it is getting smaller and smaller (eg PCB and some consumer goods), the accuracy of the laser marking system must be improved. Ti's DAC11001A and DAC91001 have 20 bits and 18-bit resolutions, respectively. Resolution As an important parameter, the number of voltage steps that are converted to DAC output. For example, the 18-bit resolution has 262,144 unique code (see Figure 3), allows lasers to be controlled from multiple motor locations. The 20-bit DAC has 1,048,576 unique code that provides a finer granularity and higher precision.
What are the advantages of using 20 DAC performance laser marking systems? What kind of step size do you need to get equal to 1 radians? Compared with the full-scale range of about 1 radians, the resolution of existing systems is 10 microecence. Ideally, this is equivalent to 18-bit resolution, but many designers want to reach 20-bit resolution due to the nonlinearity of the system level. At this time, the DAC11001A can provide more finely controlled by the DAC11001A by providing nearly four times.
Another problem that needs to be considered is the motor vibration. Any fault in the laser marking system will adversely affect the final etching. Such systems are very sensitive to motor residual vibrations of motor because the control loop has a multi-level transfer function. From the selection of low vibration motors to use complex control system logic, designers use a variety of complex technologies to optimize performance. A key factor in motor vibration is that the DAC is generated due to input code to code change. DAC11001A and DAC91001 have very low 1NV-S code to code, and the code-independent peak pulse output. This is achieved by an integrated tracking holding circuit, the circuit causes the DAC's output of the coded pulse that is inherent in the code inherent in the internal trapezoidal resistance network.
As we have seen, the laser marking machine must handle many variables to achieve higher precision. DAC plays a key role in solving this problem, making it easier for designers. Innovative solutions with higher resolution can increase accuracy, achieve better anti-wrong, which is very important in laser marking system design.
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