Ultra-small imaging system for cell phone camera using birefringent lenses

Yupeng Zhang*, Toshitsugu Ueda

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)


    In this research, an ultra-small imaging system using birefringent lenses was presented. This system is designed for the next generation mobile phone camera with an image sensor of smaller pixel size. The system thickness is reduced to approximately 1.7mm (from the first lens' front surface to the image sensor) by employing one aspheric lens and one spherical lens made of birefringent uniaxial crystal, which also act as two optical low pass filters (OLPFs). In conventional cameras, however, the OLPFs are stacked up and assembled separately with optical lenses, which makes it difficult to reduce system thickness. Quantitative and visual results of ordinary and extra-ordinary ray separation on the image plane demonstrated that the birefringent lenses system is able to cut off all higher spatial frequencies than the Nyquist frequency of a 0.5μx0.5μ image sensor.

    Original languageEnglish
    Title of host publicationProceedings of IEEE Sensors
    Number of pages4
    Publication statusPublished - 2011
    Event10th IEEE SENSORS Conference 2011, SENSORS 2011 - Limerick
    Duration: 2011 Oct 282011 Oct 31


    Other10th IEEE SENSORS Conference 2011, SENSORS 2011

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering


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