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US 5,289,316 AGranted
Measuring objective
AssigneeCarl-Zeiss-Stiftung
InventorGerd Furter
Life of this patent
Estimating the term…
Abstract
The invention is directed to a measuring objective having a large free operating space and having very small imaging errors with respect to coma, astigmatism and distortion. The main rays are, at least at one objective side, inclined to each other in one directional component and are parallel to each other in the directional component perpendicular thereto.
Claims14
An objective for measuring distances comprising:
- at least one lens group defining an optical axis and including a plurality of lenses;
- a first beam deflecting unit mounted on said axis forward of said lens group to define a beam entry surface;
- a second beam deflecting unit mounted on said axis rearward of said lens group to define a beam exit surface;
- said first deflecting unit including a refracting optical prism having a first side extending above and below said optical axis and defining said entry surface and having a second side likewise extending above and below said optical axis and facing away from said first side;
- said second deflecting unit including a refracting optical prism having a first side extending above and below said optical axis and defining said exit surface and having a second side likewise extending above and below said optical axis and facing away from said first side of said refracting optical prism of said second deflecting unit;
- said prism of said first deflecting unit having a first linear edge formed on one of said sides thereof and said prism of said second deflecting unit having a second linear edge formed on one of said sides thereof;
- and,
- said first and second linear edges being substantially perpendicular to said optical axis and being substantially parallel to each other.
5 more elements
An objective for measuring distances comprising:
- a lens group defining an optical axis and including a plurality of lenses;
- a beam deflecting unit mounted on said axis forward of said lens group;
- said beam deflecting unit including a refracting optical prism having a first side away from said lens group and a second side facing toward said lens group;
- said beam deflecting unit including a refracting optical prism having a first face on said first side defining a beam entry surface for receiving a beam which is passed by said optical prism to said lens group;
- mirror means mounted on said axis rearward of said lens group for reflecting the beam back into said lens group and toward said optical prism;
- said refracting optical prism having a second face formed on said first side to define a beam exit surface through which said beam passes after passing through said refracting optical prism;
- said first and second sides both extending above and below said optical axis;
- said optical prism having a linear edge formed on one of said sides thereof;
- and,
- said linear edge being substantially perpendicular to said optical axis.
7 more elements
Dependencies are inferred from the claim text.