Case Study: Reverse Engineering of Lenses

Reverse optical engineering focuses on understanding the function of existing optical systems or components through detailed examination. This approach allows for the replication or enhancement of these components, proving useful when the original design is unavailable or when existing technology needs improvement. It is essential for creating custom optical systems, efficiently replicating complex designs, and uncovering original engineering methods. This process enables the refinement of optical system focal points and the capture of detailed information for further analysis and manufacturing using the improved design.

Unlike the traditional design process, which begins from scratch, reverse engineering starts with an existing machine or component and works backward to disassemble and analyze each part. In this instance, the original lens manufacturer ceased production, yet there remains a small market demand, necessitating reverse engineering to continue production.

Manufacturing Specifications

- Diameter: 32mm
- Focal Length: 25mm (10X magnification)
- Eye Relief: 25-250mm

Reverse Engineering Process for Lenses

Provision of Customer Samples The customer must provide two sample lenses: one for image quality testing and the other for destructive testing to analyze lens parameters and structural components. Additionally, the customer should describe the lens’s intended use to inform the later design stages.

Simulating the Optical Path The customer required an eyepiece lens capable of balancing a 25-200mm eye relief distance while maintaining high imaging quality using a smartphone. The design had to allow users to look away from the optics without losing image quality.

- Simulation Figures:
  - Figure 2: Demonstrates the lens’s performance at short visual distances with high resolution.
  - Figure 3: Shows the lens’s capability at both short and long visual distances, with some reduction in edge resolution and increased distortion when used with a smartphone.

Testing Lens Parameters Initial testing focuses on primary parameters such as focal length, entrance pupil diameter, back intercept, and image quality. The lens dimensions are also measured and remain unchanged in the reverse engineering process.

Test data from the lenses are input into optical design software like Zemax for optimization. Any errors detected are corrected to ensure accuracy.