Optical: systems and elements – Single channel simultaneously to or from plural channels – By surface composed of lenticular elements
Patent
1994-04-13
1997-07-01
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By surface composed of lenticular elements
359455, G02B 2710
Patent
active
056444311
ABSTRACT:
There is disclosed a partially transparent, directional viewing sheet formed of plastic material with lenses, preferably lenticular lenses, formed on both the front and the back surfaces of the sheet, there being on at least one of the surfaces intervening spaces between the lenses which spaces are not fully transparent and may be imprinted with an image that is viewable through the sheet from some directions. Preferably such lenses separated by non-transparent intervening spaces are concave lenses with a radius of curvature which is less than the radius of curvature of convex lenses, on the other surface, causing the concave lens focal length to be less than, typically about one-half of, the focal length of the convex lenses. The thickness of the sheet and hence the spacing between each concave lens and a corresponding convex lens causes the lenses axial spacing to be about the difference in focal lengths of the lenses producing the effect of a tiny Galilean telescope. The view through such a sheet in a direction substantially aligned with the optical axis of the tiny telescope is a minimally distorted view of objects distant from or near to the opposite side of the sheet while off-axis viewing will present the image imprinted on the intervening spaces between the concave lenses on the back surface of the sheet. Alternative embodiments employ intrusive mask elements between concave lens elements facilitating use for directional control of solar energy while maintaining image transmission for one direction of viewing.
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patent: 4208086 (1980-06-01), Perry
patent: 4867514 (1989-09-01), Waldron
patent: 5270859 (1993-12-01), Wirth et al.
Epps Georgia Y.
Keegan Robert R.
Robbins Thomas
University of Arkansas N.A.
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