Dust is the most critical problem in scanner manufacturing. For example, if dust gets into the optical unit, which is the core part of the scanner, a black line might appear in the scanned data. In order to prevent this problem, we chose to manufacture dust sensitive parts in a clean room.
However, as the number of units manufactured increased, the more trouble we had with dust. Thus, our battle with dust began.
The fundamental concepts of keeping dust away are to prevent it from being brought into the factory and to prevent it from being produced within the factory. However, it is not easy to determine where the dust is coming from or where it is produced, and countermeasures are not possible until this is known. But never once did Fujitsu give up. "Each and every employee was involved in considering how to improve from the bottom up," reflects Corporate Officer Naoyuki Wazumi of PFU Techno Wise Limited. By listening to feedback from the floor and continually improving, we have perfected the manufacturing environment with a defect rate of close to zero.