US 11,940,304 B2
Position-measuring device having four scanning units and two measuring graduations
Josef Mitterleitner, Chieming (DE); and Thomas Becker, Traunreut (DE)
Assigned to DR. JOHANNES HEIDENHAIN GMBH, Traunreut (DE)
Filed by DR. JOHANNES HEIDENHAIN GmbH, Traunreut (DE)
Filed on Aug. 18, 2021, as Appl. No. 17/405,065.
Claims priority of application No. 20192999 (EP), filed on Aug. 27, 2020.
Prior Publication US 2022/0065668 A1, Mar. 3, 2022
Int. Cl. G01D 5/244 (2006.01); G01D 5/347 (2006.01)
CPC G01D 5/24438 (2013.01) [G01D 5/34707 (2013.01); G01D 5/34715 (2013.01); G01D 5/34746 (2013.01); G01D 5/3473 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A position-measuring device, comprising:
a scale having a first measuring graduation and a second measuring graduation, the first measuring graduation including a series of graduation structures which each extend parallel to a first direction, the second measuring graduation including a series of graduation structures which each extend parallel to a second direction, the first and second directions extending at a respective angle different from 0° with respect to a longitudinal axis of the scale;
a first scanning unit associated with the first measuring graduation for scanning the first measuring graduation;
a second scanning unit associated with the second measuring graduation for scanning the second measuring graduation;
a third scanning unit associated with the second measuring graduation for scanning the second measuring graduation; and
a fourth scanning unit associated with the first measuring graduation for scanning the first measuring graduation, and
wherein a first straight connecting line running through centers of the first and fourth scanning units and a second straight connecting line running through centers of the second and third scanning units form a predetermined angle therebetween, the predetermined angle being not equal to a sum of the angle of the first direction and the angle of the second direction.