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.
|ホスト出版物のタイトル||Proceedings of IEEE Sensors|
|出版ステータス||Published - 2011|
|イベント||10th IEEE SENSORS Conference 2011, SENSORS 2011 - Limerick|
継続期間: 2011 10月 28 → 2011 10月 31
|Other||10th IEEE SENSORS Conference 2011, SENSORS 2011|
|Period||11/10/28 → 11/10/31|
ASJC Scopus subject areas