Offset spectra lens system for a two spectra automatic focusing

Details Offset spectra lens system for a two spectra automatic focusing Offset spectra lens system for a two spectra automatic focusing

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.
A.E. Conrady, Applied Optics and Optical Design, 1957, pp. 143-159.
Warren J. Smith, Modern Optical Engineering, 1966, pp. 280-283 and 334-336.

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