Browse Prior Art Database

Wide Angle Lens With Stop as First Element

IP.com Disclosure Number: IPCOM000074768D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Gardner, LV: AUTHOR

Abstract

This lens has a 110 degree field of view. The first element in the system is the stop S which has the smallest aperture in the system. Both the size and the location of S are the inverse of that found in most other wide-angle lenses. The lens consist of eight spherical-surface elements, has an f number of 3.0, and is achromatic for 5893 to 9000 Angstroms when constructed as follows: (Image Omitted)

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Wide Angle Lens With Stop as First Element

This lens has a 110 degree field of view. The first element in the system is the stop S which has the smallest aperture in the system. Both the size and the location of S are the inverse of that found in most other wide-angle lenses. The lens consist of eight spherical-surface elements, has an f number of 3.0, and is achromatic for 5893 to 9000 Angstroms when constructed as follows:

(Image Omitted)

Element 8 represents a detector substrate and is inconsequential to lens performance. Element 7 is a field flattener.

Elements 3, 4, 5 and 6 are the eyepiece section. Elements 1 and 2 are the wide-angle detector immersion lens simile.

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