发明名称 |
Photoelectric encoder having an interference pattern signal processing unit detects the pseudo-random data of the absolute pattern of an absolute scale |
摘要 |
A photoelectric encoder includes an absolute scale provided with an absolute pattern based on pseudo-random data, and a detection head including a light source that emits light to the absolute pattern of the absolute scale, and a light receiving unit that receives light from the absolute pattern, and it detects an absolute position of the detection head with respect to the absolute scale. In the photoelectric encoder, the absolute pattern is composed of a grating part and a dark part arranged in a repetitive manner. The photoelectric encoder further includes an interference pattern generation means that generates an interference pattern in combination with the grating part, and an interference pattern signal processing unit that detects the pseudo-random data of the absolute pattern based on the interference pattern received by the light receiving unit. |
申请公布号 |
US9383231(B2) |
申请公布日期 |
2016.07.05 |
申请号 |
US201414474594 |
申请日期 |
2014.09.02 |
申请人 |
MITUTOYO CORPORATION |
发明人 |
Yaku Toru;Kato Yoshiaki |
分类号 |
G01D5/347 |
主分类号 |
G01D5/347 |
代理机构 |
Rankin, Hill & Clark LLP |
代理人 |
Rankin, Hill & Clark LLP |
主权项 |
1. A photoelectric encoder comprising:
an absolute scale provided with an absolute pattern based on pseudo-random data; a detection head including a light source that emits light to the absolute pattern of the absolute scale, and a light receiving unit that receives light from the absolute pattern, wherein the photoelectric encoder detects an absolute position of the detection head with respect to the absolute scale, and the absolute pattern is composed of a grating part and a dark part arranged in a repetitive manner; an interference pattern generation means that generates an interference pattern in combination with the grating part; and an interference pattern signal processing unit that detects the pseudo-random data of the absolute pattern based on the interference pattern received by the light receiving unit. |
地址 |
Kawasaki JP |