Monitoring system for a predetermined field of view

Claim 2

A condition detecting device for detecting various conditions within a predetermined field angle, said condition detecting device comprising: (a) a spatial filter element including a solid poly-facet prism member having a convex face on the side of the fields of view with a plurality of plano facts cut into said convex face for permitting trasmittal of rays therethrough from an object to define respective separate fields of view for each facet; (b) a single converging lens element for converging the rays which have passed through the spatial filter element; (c) sensor means for sensing said rays converged by said converging lens element and for producing a signal having various features depending on the condition of said object; and (d) descriminating means for discriminating one or more features of said signal.

Claim 3

A condition detecting device as claimed in claim 1, wherein said sensor means is sensitive to infrared rays.

Claim 4

A condition detecting device as claimed in claim 1, wherein said sensor means has a plane face sensitive to said rays.

Claim 5

A condition detecting device as claimed in claim 1, wherein said sensor means is sensitive to infrared rays.

Claim 6

A condition detecting device as claimed in claim 4, wherein said sensor means has a plane face sensitive to said rays.

Claim 7

The invention of claim 1 wherein said converging lens element is a plano-convex lens with its convex face facing said sensor means.

Claim 8

The invention of claim 6 wherein said solid prism has a plano-convex configuration with the plano face adjacent the plano face of the plano-convex lens.

Claim 9

An improved lift control system for transporting people comprising: (a) a cage member for supporting the people; (b) means for supporting the cage member for movement; (c) a spatial filter provided inside the cage member for detecting various conditions within a predetermined field angle, said spatial filter comprising: (i) a spatial filter element defined by a solid polyfacet prism member having a convex face on the side of the fields of view with a plurality of planofacets cut into said convex face, said spatial filter element provided for filtering rays emitted or reflected from an object, with each facet defining separate fields of view; (ii) a lens assembly for converging the rays which have passed through the spatial filter element; and (iii) sensor means for sensing the converged and filtered rays, said spatial filter Producing a signal having various features representative of the conditions within the field angle; (d) discriminating means for discriminating at least one feature of said signal, and for producing a control signal when at least one of said features being discriminated falls within a predetermined range; and (e) means responsive to said control signal from said discriminating means for effecting an operation related to said lift control system.

Claim 10

An improved lift control system for transporting people comprising: (a) a cage member for supporting the people; (b) means for supporting the cage member for movement; (c) a spatial filter provided inside the cage member for detecting various conditions within a predetermined field angle, said spatial filter comprising: (i) a spatial filter element defined by a solid polyfacet prism member having a convex face on the side of the fields of view with a plurality of planofacets cut into said convex face, said spatial filter element provided for filtering rays emitted or reflected from an object, with each facet defining separate fields of view; (ii) a lens assembly for converging the rays which have passed through the spatial filter element; and (iii) sensor means for sensing the converged and filtered rays, said spatial filter Producing a signal having various features representative of the conditions within the field angle; (d) discriminating means for discriminating at least one feature of said signal, and for producing a control signal when at least one of said features being discriminated falls within a predetermined range; and (e) means responsive to said control signal from said discriminating means for effecting an operation related to said lift control system.