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US 4,730,920 AGranted
Optoelectronic stadia
AssigneeNestle & Fischer
InventorsHarald Schlemmer, Rainer Stuhlmuller
Life of this patent
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Abstract
An optoelectronic stadia is proposed, which is intended for a levelling system with a rotary laser. The stadia has at least one vertical row of light sensitive diodes, which are electrically connected in matrix form. One diode pair in each case forms one matrix node. The column signals and line signals are decoded and evaluated in an evaluation apparatus and the measured result is supplied to a display means. The matrix arrangement of the diodes leads to a very simple construction with relatively few components.
Claims10
An optoelectric stadia for a surveying system with a rotary laser beam which comprises:
- a plurality of optoelectronic elements provided on one side of the stadia;
- display means;
- and evaluation means connecting said optoelectronic elements to said display means;
- wherein said optoelectronic elements are connected to a circuit arrangement which defines at least one matrix having at least two column components and at least two line components, wherein the optoelectronic elemtns are arranged in at least one vertical row with each said row being defined by two adjacent columns of said elements and with two adjacent optoelectronic elements in said two columns forming a matrix node, each said row being subdivided into stages of the same length with each stage forming a modular arrangement;
- and wherein a first signal representative of a line component of said matrix and a second signal representative of a column component of said matrix are generated when the elements forming one of said matrix nodes are contacted by said laser beam, said signals being used to identify said one matrix node and to identify a height value.
2 more elements
Dependencies are inferred from the claim text.