Encoder system and method for determining the reading head position in an encoder system

Encoder system comprising:

• a reading head (10) having at least one first position sensor (1, 1.1, 1.2) and at least one second position sensor (2, 2.1, 2.2), wherein the position sensors (1, 1.1, 1.2, 2, 2.1, 2.2) are positioned at a fixed distance (a, a1, a2, a3, a4, a6, a6) from one another in a reading direction (12),
• a material measure (30) having a longitudinal direction (l) and a transverse direction (q), wherein the material measure (30) has a first code segment (32) in the longitudinal direction (l) with a first absolutely coded code track (34),
• wherein the reading head (10) and the material measure (30) are positioned relative to one another in such a way that the reading direction (12) corresponds to the longitudinal direction (l), and that the reading head (10) and the material measure (30) are movable relative to one another in the reading direction (12), and that a first sensor position (p1, p1.1, p1.2) on the material measure (30) can be detected by the at least one first position sensor (1, 1.1, 1.2) and at the same time a second sensor position (p2, p2.1, p2.2) can be detected on the material measure (30) by the at least one second position sensor (2, 2.1, 2.2), and
• wherein the position sensors (1, 1.1, 1.2, 2, 2.1, 2.2) are arranged on a one-piece sensor carrier (14) whose coefficient of thermal expansion is less than or equal to 2 ppm/K.