In the fields of security surveillance and Intelligent Transportation Systems (ITS), the Sony IMX290/291 has become an industry benchmark due to its 120dB High Dynamic Range (WDR). However, if the optical lens is poorly controlled, flare and ghosting under strong light can render the sensor's powerful light-sensing capabilities useless.

1. Physical Interception Logic: From "Suppressing" to "Eliminating" Stray Light

Flare is essentially the abnormal jumping of photons within an optical system. To leverage the wide dynamic potential of the IMX290, "physical interception" must be completed before light reaches the sensor:

Broadband Anti-Reflection (BBAR) Coating: While standard single-layer coatings have a reflectivity of about 1.5%, the multi-layer coatings utilized by JSD Optical reduce full-spectrum reflectivity to below 0.5%. This effectively eliminates secondary reflections between lens elements.

Extinction Engineering: Precision extinction threads are machined onto the inner walls of the lens barrel, combined with physical edge blackening of the lens elements. This combination blocks over 98% of non-imaging stray light.

Black Level Protection: A superior lens structure maintains a deep black level. Even when faced with direct 5000-nit intense light, details in the shadows remain clearly visible.

"In HDR systems, stray light control of the lens is more critical than resolving power, as it directly determines the upper limit of the system's signal-to-noise ratio." — According to technical reviews in "Sensor and Optical System Integration."

2. Specification Benchmark Table: Anti-Glare Lens Selection for IMX290/291

Based on official Sony IMX290 technical specifications, the following M12 lens parameters are recommended:

3. JSD Optical: Precision Manufacturing Driving Precise Interception

To address the intense backlighting challenges of the IMX290/291, JSD Optical ensures the purity of visual information through fundamental manufacturing processes:

Ray Tracing Simulation: During the R&D phase, simulation software is used to model the reflection paths of millions of light rays on the 1/2.8" sensor format. By adjusting lens curvature and barrel steps, potential ghosting risks are eliminated in advance.

Physical Vapor Deposition (PVD): JSD Optical possesses sophisticated vacuum coating equipment. Every lens element undergoes multi-layer nano-scale deposition, ensuring the film is not only anti-reflective but also resistant to peeling or color shifting under complex temperature fluctuations.

Delivery Consistency: Relying on automated optical inspection systems, JSD Optical ensures that mass-produced lenses meet stringent extinction standards, helping your system operate stably under extreme lighting.

4. Conclusion: Optical Front-End Determines the WDR Ceiling

The IMX290 provides an excellent electronic foundation, while JSD Optical’s anti-glare lenses are responsible for filtering out noise. Selecting an M12 lens featuring deep extinction structures and multi-layer coatings is a critical step in enhancing the stability of industrial vision systems.

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