Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1975-09-11
1977-01-25
Adams, Jr., Russell E.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250201, 250209, 354 31, G03B 708
Patent
active
040054438
ABSTRACT:
A device for automatically focusing an image in an optical system such as a camera wherein a photosensitive array having a plurality of discrete sites is positioned in the focal plane of the optical system to dissect the image into segments and determine the light intensity at each segment. Means are interposed in the focal plane to vary the focus of the image, the illumination of the photosensitive array being dependent on the degree of focus of the image. The discrete sites have a charge produced thereon depending on the degree of illumination. Address means scan the photosensitive array and read out the charges on the discrete sites to form a pulse train. Discrimination means are connected to the address means to determine when the frequency of the pulse train is maximized to indicate sharp focusing of the image, as the focus of the image is varied.
REFERENCES:
patent: 3896304 (1975-07-01), Aoki et al.
patent: 3909520 (1975-09-01), Mend et al.
"The Automatic Focusing of Optical Systems" by Peter MacKeith, The British Journal of Photo., July 4, 1975.
"DEFT: Direct Electronic Fouvier Transforms of Optical Images" Kornreich et al., Proc. of the IEEE, Aug. 8, 1974, pp. 1072-1087.
Adams, Jr. Russell E.
Semmes J. Gibson
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