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US 3,997,723 AGranted
Compact unit for optical security system
AssigneeVisual Methods, Inc.
InventorWalter T. Sandin
Life of this patent
Estimating the term…
Abstract
A thin wall-mountable unit is disclosed which produces a composite image from a card-like object placed in a slot and a person standing adjacent thereto. The unit includes a pair of lenses for focusing images of the objects on intersecting focal planes. A mirror is mounted in the unit at the intersection of the focal planes. A T.V. camera is employed to sense the composite image resulting therefrom.
Claims13
A composite image producing system including:
- a housing;
- a first lens, mounted in said housing and having an optical axis, for forming the image of a first object in a first focal plane;
- said first object being located at a first predetermined position to a first side of said optical axis;
- a second lens, mounted in said housing, for forming the image of a second object in a second focal plane which includes said optical axis;
- said second object being located at a second predetermined position;
- said second focal plane intersecting said first focal plane at a line of intersection;
- and
- a first mirror;
- said first mirror having an edge;
- said first mirror being mounted in said housing with said edge at said line of intersection and to a second side of said optical axis.
7 more elements
Dependencies are inferred from the claim text.