Telescopic camera

Details Telescopic camera Telescopic camera

1989-11-08

1991-12-10

Arnold, Bruce Y.

Optical: systems and elements

Lens

Including a nonspherical surface

359785, B29D 1100, G02B 914

Patent

active

050712381

ABSTRACT:
Disclosed is a lens system for a telescopic camera comprised of a primary lens, a secondary lens and a tertiary lens. The primary lens is a positive lens having a convex front surface and an aspheric back surface which define an optical axis. The secondary lens is a negative lens which has a concave front surface and a concave back. The front surface of the secondary lens is positioned at a predetermined fixed distance adjacent to the back surface of the primary lens and centered with respect to the optical axis. The tertiary lens is a field flattening lens having a convex front surface and a convex back surface. The front surface of the tertiary lens is positioned at a predetermined fixed distance adjacent to the back surface of the secondary lens, wherein the primary, secondary and tertiary lenses have surfaces shaped to focus on an object viewed such that a field of view of about 4.2.degree. is produced, and said lens system is capable of capturing approximately 94% of all incident photons within the optical axis.

REFERENCES:
patent: 4105308 (1978-08-01), Owen, Jr. et al.

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