Optical filter
Through the combination of the multilayer dielectric film and near-infrared absorbing glass and ultraviolet absorbing pigment, a filter with stable spectral characteristics at high incidence angles was designed, which solved the problem of reduced visible light transmittance and stray light in the prior art, and improved image reproducibility.
Patent Information
- Application Number
- CN202380088733.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-12-27
- Filing Date
- 2023-12-20
- Publication Date
- 2025-08-01
AI Technical Summary
The existing filters have reduced visible light transmittance at high incidence angles, poor image reproducibility, and are prone to stray light and glare. Especially in low-altitude camera modules, the prior art is difficult to effectively solve these problems.
The filter design is designed with a combination of dielectric multilayer films, near-infrared absorbing glass and ultraviolet absorbing pigments to ensure that the spectral characteristics change at high incidence angles are small, stray light is suppressed, and the visible light transmittance and near-infrared light shielding are improved through the absorption characteristics of near-infrared absorbing glass and ultraviolet absorbing pigments.
The spectral characteristics are stabilized at high incident angles, the visible light transmittance and near-infrared light shielding are improved, stray light and glare are reduced, and image reproducibility is improved.