Tolerancing an optical design is vital when optical modules are produced in tens of millions. In these cases the
production yield is all-important: it will decide if the product will be a success. While optical design softwares provide
powerful tolerancing tools, to get an idea of what the production yield will be, we will have to go a step further. A way
of taking this step consists in a tolerancing procedure that will use these tolerancing tools and a dedicated analysis
- A list of specifications that the lenses will have to fit into has to be established.
- A merit function that will calculate each of these specs will have to be written.
- For the tolerancing itself, a script will have to be used to write to an output file all these values for each lens
created during tolerancing
- The analysis software will read the output file, make all the desired statistics and then give the production yield and other relevant informations (e.g. yield and behavior of any spec)
Micro cameras for mobile phones require specific opto electronic designs using high-resolution micro technologies for compromising optical, electronical and mechanical requirements. The purpose of this conference is to present the optical critical parameters for imaging optics embedded into mobile phones. We will overview the optics critical parameters involved into micro optical cameras, as seen from user point of view, and their interdependence and relative influence onto optical performances of the product, as: -Focal length, field of view and array size. -Lens speed and depth of field: what is hidden behind lens speed, how to compromise small aperture, production tolerances, sensitivity, good resolution in corners and great depth of field -Relative illumination, this smooth fall off of intensity toward edge of array -Resolution; how to measure it, the interaction of pixel size, small dimensions -Sensitivity, insuring same sensitivity as human being under both twilight and midday sunny conditions. -Mischievous effects, as flare, glare, ghost effects and how to avoid them -How to match sensor spectrum and photopic eye curve: IR filter, and color balancing. We will compromise above parameters and see how to match with market needs and productivity insurance.