【179】Optical Component Flatness of 0.03mm – Fengchuang Lets R&D Stop Compromising

【179】Optical Component Flatness of 0.03mm – Fengchuang Lets R&D Stop Compromising

Keywords: Flatness Optical Components Fengchuang Plastics Manufacturing Quality

Dr. Chen is an optical engineer at an AR glasses company. He designed a mounting bracket for the optical module that requires a flatness of 0.03mm. That single number stalled the entire project for four months. The procurement department contacted more than a dozen injection molding companies, and none could meet the spec. Some quoted with a flatness of 0.05mm, claiming “0.03mm is impossible.” Others reluctantly took the order but produced three sample batches, with the best flatness reaching only 0.042mm.

During an internal project meeting, someone suggested loosening the flatness standard to 0.05mm. But Dr. Chen disagreed, saying, “Relaxing it by 0.02mm will degrade optical image quality by 15% – that would make the product mediocre.” The R&D director was caught in a bind, torn between the technical team’s insistence and the reality that no supplier could meet the requirement.

Dr. Chen was under immense pressure during that period. He spent two to three hours each day calling various injection molders, explaining the importance of flatness, only to be told “can’t do it.” He began to doubt his own design – had he really set the bar too high?

Then, the procurement manager came across a technical post by Fengchuang on an injection molding forum. It wasn’t an ad. The post discussed flatness control methods in detail, analyzing the causes of warpage and offering solutions. A contact was left at the end. The manager forwarded the post to Dr. Chen, who read it and said, “This person really understands the technology.”

After reaching out to Fengchuang, they didn’t rush to quote. Instead, they asked for the product’s 3D model and material specifications, ran a mold flow analysis, and the next day sent back a six-page report. It identified three design details that could cause flatness issues and provided optimization suggestions. One recommendation was to adjust wall thickness variations at the design stage for better uniformity. Dr. Chen modified the drawings accordingly and handed them over to Fengchuang to build the mold.

Three weeks later, the first sample batch arrived at Dr. Chen’s lab. He inspected ten complete samples using a laser flatness measurement system. The results: 0.022mm, 0.018mm, 0.025mm, 0.020mm, 0.023mm, 0.019mm, 0.024mm, 0.021mm, 0.020mm, 0.022mm. All ten samples had flatness within 0.025mm. Dr. Chen immediately photographed the inspection report and sent it to the work group chat with the message: “Finally found a supplier that can achieve this precision.”

The AR glasses are now in mass production, with optical image quality reaching 98% of the design target – exceeding expectations. Dr. Chen says, “I used to compromise with suppliers. Now, suppliers help me realize my vision.”

Struggling to find a supplier for optical component flatness? Fengchuang Plastics achieves flatness within 0.03mm, so your design doesn’t compromise – and your product stands out.