Patent ID: 7096751
Filing Date: 2006-08-29
Classification: G01B

Abstract:
1. A measuring apparatus comprising: a base fixed onto a rotary table; a detection member mounted perpendicularly on said base; and a vertical position detector for detecting a vertical position of an upper surface of said detection member; a rotational angular position detector having first and second members mounted in relatively rotatable fashion about a preset rotational center axis, one of said members being provided with a scale and the other member with a reading device, wherein said first member is mounted fixedly on said base; and a restraining means engaging with said second member of said rotational angular position detector and thereby restraining rotation of said second member, while allowing said base and said rotational angular position detector to move in a vertical direction, and wherein: said detection member is formed from a ring-shaped member which is mounted perpendicularly on said base by orienting a center axis of said ring-shaped member at right angles to an upper surface of said rotary table, and said first member of said rotational angular position detector is mounted fixedly on said base with said rotational angular position detector accommodated within said detection member.