Browse Prior Art Database

Fly's Eye Lens and Fabrication Process

IP.com Disclosure Number: IPCOM000095776D
Original Publication Date: 1964-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Mutter, WE: AUTHOR [+2]

Abstract

This fly's eye lens has reduced wear from scratching and improved dimensional stability. The lens is amenable to the fabrication of photographic masks for the purposes described in the IBM Journal of Research and Development, April 1963, pages 146 through 150.

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Fly's Eye Lens and Fabrication Process

This fly's eye lens has reduced wear from scratching and improved dimensional stability. The lens is amenable to the fabrication of photographic masks for the purposes described in the IBM Journal of Research and Development, April 1963, pages 146 through 150.

Cylindrical mesas 20 are ultrasonically cut on one side of a polished glass disk 22 having a planar surface 26. Mesas 20 appear as an array in a lens element 24. Disk 22 is placed on a sooted quartz slab, not shown. The lens is fired in a furnace to fuse down mesas 20 into spherical lens elements 28. During fusion, the glass becomes viscous and surface tension forces produce the elements 28.

For good optical images, the radius of curvature elements must be constant over the useful aperture region of the individual lens elements. Also, the radius of curvature of each lens element must be the same. Finally, the fusion must be terminated at the proper point to produce the desired radius of curvature. The time/temperature fusion is regulated to give the desired radius. When the lens 24 is furnace fused, the starting thickness of wafer 22 is slightly larger than that of the desired lens. After fusion, surface 26 is polished down so that the images are coincident with the back surface.

As one example, a pyrex glass blank 80 mils thick and 1.75" in diameter is cut with 1450 mesas on .030" centers. Glasses other than pyrex can also be employed. The mesas are about . 016" by .0...