| 摘要 |
In a structure for protecting scale graduations, in which a graduation unit (14) formed on a scale base (12) is protected by a scale cover (16) arranged on the top surface side of the graduation unit (14), a space between the scale base (12) and the scale cover (16) along the entire lateral periphery of the graduation unit (14) is sealed using an adhesive agent mixed with a powder material (32) such as a glass powder for blocking penetration of graduations-deteriorating components, to form a periphery adhesive layer (30). Thus, it is possible to prevent the aged deterioration of the graduation unit (14) caused by the graduations-deteriorating components such as moisture. In addition, the scale cover (16) may be supported on the scale base (12) by a height regulating unit (40) provided along the periphery of the graduation unit (14), so that variations in encoder output due to unevenness in thickness of an adhesive agent (18) for joining the scale cover (16) with the graduation unit (14) can be prevented. |
