The lens ratio, also known as the focal ratio or f-number, is defined as the ratio of the lens's focal length to the diameter of its entrance pupil (aperture). It is expressed as: f-number (f/N) = Focal Length / Aperture Diameter A lower f-number (e.g., f/1.8) indicates a larger aperture, allowing more light to enter the optical module, which improves brightness and low-light performance. Conversely, a higher f-number (e.g., f/4) reduces light intake but increases depth of field and sharpness across the image.
In optical modules used for compact cameras, projectors, or DLP systems, the lens ratio affects several key parameters:
A compact camera module may have the following specifications:
The optical module lens ratio (f-number) is a critical design parameter that influences brightness, field of view, depth of field, and overall optical performance. Designers must carefully select the f-number in conjunction with focal length, aperture size, and illumination type to optimize the module for its intended application, whether in cameras, projectors, or laser-based systems .
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