Non-linear lens

Details Non-linear lens Non-linear lens

1974-11-04

1976-04-27

Corbin, John K.

350181, B29D 1318, G02B 1308

Patent

active

039531112

ABSTRACT:
A non-linear lens possesses distortion characteristics which are such that objects along the optical axis of the lens occupy disproportionately large areas of the image cast by the lens, whereas objects near the periphery of the field of view occupy a disproportionately small area of the image. The distortion characteristics approximate the formula H=sin.sup.1/3 .theta. where H is height measured from the optical axis and .theta. is the angle measured from the optical axis. The image cast by the lens falls on the vidicon of a television camera where it is scanned and transmitted to a projector. Since the lens enlarges objects in the vicinity of the optical axis, those objects are transmitted with much greater detail than objects in the peripheral region of the view. The transmitted image is reproduced at a projector and the reproduced image is rectified through another lens having identical distortion characteristics. This lens casts the rectified image on a spherical screen. The final image which appears on the screen possesses a high degree of acuity in the region of the optical axis and substantially less acuity in peripheral regions. The resolution throughout the entire field of the reproduced image corresponds quite closely to the resolution characteristics of the human eye.

REFERENCES:
patent: 3037426 (1962-06-01), Hughues
Rigler; A. K. and Vogt; T. P., "Spline Functions: an Alternative Representation of Aspheric Surfaces," Applied Optics, Vol. 10, No. 7, pp. 1648-1651, July, 1971.

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