Optical: systems and elements – Lens – With light limiting or controlling means
Reissue Patent
2005-09-20
2005-09-20
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With light limiting or controlling means
C359S794000
Reissue Patent
active
RE038799
ABSTRACT:
delete-start id="DEL-S-00001" date="20050920" ?A lens assembly particularly suited to use with high resolution digital cameras and other portable electronic devices. The lens includes a positive powered front group having one or two elements and a second, aberration correcting, rear group having in order from the front a bi-concave element, a meniscus element and a bi-concave element. The aperture stop plane is just in front of the front group. A combined operator and shutter device is positioned at the aperture stop plane. All of the lens elements are made of glass and have spherical surfaces.delete-end id="DEL-S-00001" ?insert-start id="INS-S-00001" date="20050920" ?An objective lens for use in a digital camera or cell phone having a camera body, the lens having a sensor such as a CCD providing an active surface that serves as a focal plane, a digital image corresponding to a varying light image falling on the focal plane, a lens assembly for forming the varying light image, the lens assembly comprising a positive doublet having a first and a second element or a singlet, at the object end of the lens assembly followed by a lens element group spaced from the positive doublet or alternatively, a positive singlet and having three elements, in order from the object end, a bi-concave element, a meniscus element and a bi-convex element, and an aperture stop located at a predetermined distance in front of the positive doublet or positive singlet lens element at the object end of the lens assembly.insert-end id="INS-S-00001" ?
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Modern Optical Engineering, Warren J. Smith, McGraw Hill, Inc., Chapter 6 p. 133, 1992.
Modern Lens Design, Warren J. Smith, McGraw Hill, Inc., Chapter 2, p. 20, 1992.
Kirk James F.
Lester Evelyn A.
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