Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2005-03-15
2005-03-15
Spector, David N. (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S715000, C348S335000, C382S275000
Reexamination Certificate
active
06867933
ABSTRACT:
An image-taking apparatus has an image sensor for converting an optical image into an electrical signal, and a taking lens system for forming the optical image on the light-receiving surface of the image sensor. The most object-side surface of the taking lens system is an aspherical surface that has a positive optical power in a central portion thereof and a negative optical power in a peripheral portion thereof, and the following condition is fulfilled: −90<Da<−20, where Da represents the distortion (%) observed at the maximum half view angle in the diagonal direction of the image sensor.
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Y. Kuniyoshi et al., “A Foveated Wide Angle Lens for Active Vision”, Proc. IEEE Int. Conf. Robotics and Automation, pp. 2982-2988, 1995, URL: http://www.is.aist.go.jp/acac/publications/ICRA95.ps.
Y. Suematu et al., “A Wide Angle Vision Sensor with Fovea—Design of Distortion Lens and Simulated Images--”, IEEE International Industrial Electronics Conference, USA, pp. 1770-1773, 1993.
Minolta Co. , Ltd.
Sidley Austin Brown & Wood LLP
Spector David N.
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