Optical: systems and elements – Lens
Patent
1998-11-30
1999-10-26
Nelms, David
Optical: systems and elements
Lens
359615, 359721, 359823, 396 92, 396 82, 396 49, G02B 310, G02B 702, G03B 300
Patent
active
059738464
ABSTRACT:
An improved auto-focus system for a digital camera has a lens designed to have the focus of two spectra offset from each other by a predetermined amount. The two offset spectra are used to calculate two focus signals. Once the two focus signals are calculated the correct direction to move the lens system to set the optimum focus can be determined.
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Allen Nussbaum, Optical System Design, 1998, pp. 117-120.
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Hewlett--Packard Company
Lester Evelyn A.
Nelms David
Webb Steven L.
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