METHOD OF TRIDIMENSIONAL MEASURING, REFERENCE SCALE AND SELF-ILLUMINATING REFERENCE SCALE FOR TRIDIMENSIONAL MEASURING

Title:

METHOD OF TRIDIMENSIONAL MEASURING, REFERENCE SCALE AND SELF-ILLUMINATING REFERENCE SCALE FOR TRIDIMENSIONAL MEASURING

Document Type and Number:

WIPO Patent Application WO/1991/018258

Kind Code:

A1

Abstract:

According to the present invention, an observing machine is set at an observing point and collimation targets are disposed at three fixed points. By collimating the three fixed points from the observing machine, horizontal angles and height angles of three types are measured, respectively, and equations of error about the horizontal angles, height angles, distances between the three fixed points and straightnesses between the fixed points are established from these observed data. First, approximate values are obtained from the observed data, and further, by utilizing the method of least squares, the positions of the respective points can be obtained in details. Furthermore, by collimating the three fixed points and points to be sought from the observing machine, the horizontal angles and the height angles of three types are measured, respectively, so that the positions of the points can be obtained in details. Further, by forming three targets on a subtense bar at predetermined distances, at least the positions of the points can be obtained from the observation of the distances between the three points. Furthermore, by setting the observing machine at a known observing point and by positioning a measuring portion specified by the three fixed points at the point to be sought, collimation targets can be disposed at the three fixed points. By collimating the three fixed points from the observing machine, the positions of the three fixed points can be obtained in details. Further, by forming a measuring end portion at the forward end portion of a reference scale, a position of the measuring point can be obtained even when the measuring point cannot be directly observed from the outside. Furthermore, since a plurality of targets are formed of photoconductive optical material such that the internal light is emitted as a diffused flux of light, collimation can be easily performed even in a relatively dark place.

Inventors:

ISAWA NOBUO (JP)
SAKIMURA RITSUO (JP)
KATSUME KEIKOKU (JP)

Application Number:

PCT/JP1991/000663

Publication Date:

November 28, 1991

Filing Date:

May 17, 1991

Export Citation:

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Assignee:

TOPCON CORP (JP)

International Classes:

G01B11/03; G01C1/02; G01C15/00; G01C15/06; G01S17/06; (IPC1-7): G01B11/00; G01C15/00; G01C15/06

Foreign References:

JPS5833105A	1983-02-26
JPS6134406A	1986-02-18
JPH01145516A	1989-06-07
JPS58191920A	1983-11-09
JPS61277012A	1986-12-08
JPS54116258A	1979-09-10

Other References: