LAYERED LENS STRUCTURES AND METHODS OF PRODUCTION
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Abstract
A microlens structure includes lower lens layers on a substrate. A sputtered layer of glass, such as silicon oxide, is applied over the lower lens layers at an angle away from normal to form upper lens layers that increase the effective focal length of the microlens structure. The upper lens layers can be deposited in an aspherical shape with radii of curvature longer than the lower lens layers. As a result, small microlenses can be provided with longer focal length. The microlenses are arranged in arrays for use in imaging devices.
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Citations
27 Claims
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1. -19. (canceled)
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20. A processor based system comprising:
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an imager integrated circuit substrate with a microlens array thereover, the microlens array comprising a lower lens layer, said lower lens having a first focal length; and
an upper lens layer over the lower lens layer, said upper and lower lenses having a combined second focal length different from said first focal length, and wherein the upper lens layer has a curvature having a first radius and the lower lens layer has a curvature having a second radius, wherein the first and second radii are different from one another and the first and second curvatures extend in the same direction, the microlens array supported by the imager IC substrate;a central processing unit in communication with the imager IC, said communication occurring over a system bus; a system memory in communication with the central processing unit and imager IC over the system bus; and an input/output device connected to and in communication with the system bus. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification