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*MDR: The installation distance from the camera module to the relay lens camera end . WDV: Distance from the camera module to the simulated imaging position. WDC: Distance from the relay lens object end to the test card.
• Reducing Testing Cost
When the camera module is tested, you need a large test distance and a large target. If the relay lens is used, you can shorten the test distance and reduce the test chart, thereby reducing the test cost in the end.
• Improving Test Credibility
Using relay lens in testing can ensure high-quality imaging and footage. What's more, due to the standard test environment, the impact of random errors and uncontrollable factors on the test results can be significantly reduced and the test credibility can be improved.
• Increasing Production Efficiency
As relay lens is widely used in the testing of camera modules, the size of production and testing equipment related to camera modules has been well controlled, improving productivity and reducing costs. It also provides effective and feasible solutions for other applications that require testing of camera, such as laboratories.
Relay lens is mainly used for camera resolution test. With the development of mobile camera, its application has been constantly extended. It has been used in vehicle, security, video conference equipment, smart home and other fields. In particular, it plays an irreplaceable role in the production and testing of wide-angle and long-focus modules.
Currently, simulation testing (relay lens or collimator array) is almost the only solution in all mass AA (active alignment) production processes, module focusing, and product terminal testing.
Mobile Camera
On-Board Camera
Security Camera
Video Conference Camera
Smart Home Camera
1: FOV
The design FOV of a relay lens shall be slightly larger than the FOV of the camera module.
2: Installation
The parameter design of relay lens takes into account the support for installation structure, so the following three data should be considered when selecting a relay lens:
MDR (the distance from the mechanical rear surface of relay lens to the camera viewpoint) of 6-40mm is suitable;
WDC (the distance from the mechanical front surface (non-optical surface) of relay lens to the chart being tested) shall be usually 150-400mm;
The maximum chart size that the test environment can support.
3: Entrance pupil diameter
The entrance pupil diameter (EFL focal length/F.no focal number) of a product shall be smaller than the exit pupil diameter of relay lens.
The luminous area shall be customized according to the parameters of a relay lens; Uniformity shall be greater than 90%; Color temperature shall be 2,700-7,000k; Various infrared bands are optional.
Film is most commonly used; Accuracy shall be ±10 μm; Accuracy shall not be less than 8,000DPI; Suitable edge sharpness of graphics.
Select a relay lens according to its optical parameters and test environment.
The center of the tested product, relay lens and chart shall be on the same optical axis; Fixed or adjustable height.
Camera Module
