US 11,656,338 B2
Retroreflector with sensor
Thomas Jensen, Rorschach (CH); Andreas Schwendener, Chur (CH); and Johan Stigwall, St. Gallen (CH)
Assigned to HEXAGON TECHNOLOGY CENTER GMBH, Heerbrugg (CH)
Filed by HEXAGON TECHNOLOGY CENTER GMBH, Heerbrugg (CH)
Filed on Sep. 19, 2019, as Appl. No. 16/576,699.
Claims priority of application No. 18195690 (EP), filed on Sep. 20, 2018.
Prior Publication US 2020/0096610 A1, Mar. 26, 2020
Int. Cl. G01S 7/00 (2006.01); G01S 7/481 (2006.01); G01S 7/499 (2006.01); G01S 17/08 (2006.01)
CPC G01S 7/481 (2013.01) [G01S 7/499 (2013.01); G01S 17/08 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A reflector arrangement for position determination or marking target points, the reflector arrangement comprising:
at least one retroreflector, which
provides position determination for the reflector arrangement by means of parallel measurement beam reflection, and
provides a passage surface for at least a part of measurement radiation entering the retroreflector, and
at least one sensor arrangement, arranged downstream of the retroreflector in relation to a measurement beam incidence direction, the sensor arrangement having a sensor for recording measurement radiation passing through the passage surface, the sensor defining an optical axis oriented orthogonally with respect to its detection surface,
wherein:
the sensor arrangement includes a code element having a code pattern, and
the retroreflector, the code element, and the sensor being arranged such that:
the code element is arranged between the retroreflector and the sensor, and
an angle-dependent position with respect to the optical axis of a projection of the code pattern onto the detection surface can be determined by means of the sensor,
wherein the retroreflector is configured as a prism, and the prism comprises:
a light entry surface forming a triangle and,
as an aperture, the passage surface opposite the light entry surface,
wherein the reflector arrangement is configured as a 360° retroreflector having a multiplicity of retroreflector and sensor arrangement pairs, each having a retroreflector and a sensor arrangement as specified above, with
the multiplicity of retroreflectors being arranged next to one another and being configured as prisms,
the multiplicity of retroreflectors numerically corresponding to the number of sensor arrangements, and
each sensor arrangement being assigned to a retroreflector,
wherein:
the multiplicity of retroreflector and sensor arrangement pairs are arranged annularly, and
the 360° retroreflector defines an overall azimuth field of view of 360°, each of the retroreflector and sensor arrangement pairs covering a part of the overall field of view,
wherein:
a central axis A defined by the annular arrangement of the prisms extends orthogonally with respect to the optical axes of the sensors, and
the optical axes of at least two prisms have a common point of intersection with the central axis A, the position of an optical axis of a prism being defined by the respective midpoints of its light entry surface and of its passage surface.