Tham khảo tài liệu 'mechatronic systems applications part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Implementation of an automatic measurements system for LED dies on wafer 305 Computer r I I I I I I I I I I I I I I I I I I I. Fig. 2. The overall architecture showing the all hardware modules used in system. 306 Mechatronic Systems Applications Fig. 3. Coaxial lighting with diffuse type of source is used for reliable images for specular surface of the wafer. Mechanical system Because a very small field of view is used to capture high resolution image only a small area of the LED wafer can be observed by the camera in each acquisition. To cover all the LED dies the wafer needs to be moved around systematically so that all the dies can be found and located. A 4-axis mechanical move-table with proper stepping or servo motor Fig. 4. Four real image frames of the LED dies on the wafer captured by the .
