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Browse Prior Art Database

Apparatus for Measuring Relative Position

IP.com Disclosure Number: IPCOM000042456D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Tsukamoto, K: AUTHOR

Abstract

The apparatus is capable of precisely measuring relative position between a cylindrical member 1 and a hollow member 2 having a circular opening 3 in which the cylindrical member 1 is inserted, in order to align the cylindrical member 1 and the opening 3 coaxially at the predetermined relative rotational angle. The apparatus has six linear image sensor arrays C1, C2, ---- C6, such as CCD or MOS, each having a large number of cells, for example, 2048 cells, extending linearly. The hollow member 2 is fixed to the apparatus by suitable means (not shown). Consequently, the sensor arrays are positioned in front of the hollow member 2. Each of the sensor arrays C1, C2, C3 and C4 is arranged radially around the center 0 of the opening 3 and perpendicularly to other neighboring arrays.

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Apparatus for Measuring Relative Position

The apparatus is capable of precisely measuring relative position between a cylindrical member 1 and a hollow member 2 having a circular opening 3 in which the cylindrical member 1 is inserted, in order to align the cylindrical member 1 and the opening 3 coaxially at the predetermined relative rotational angle. The apparatus has six linear image sensor arrays C1, C2, ---- C6, such as CCD or MOS, each having a large number of cells, for example, 2048 cells, extending linearly. The hollow member 2 is fixed to the apparatus by suitable means (not shown). Consequently, the sensor arrays are positioned in front of the hollow member 2. Each of the sensor arrays C1, C2, C3 and C4 is arranged radially around the center 0 of the opening 3 and perpendicularly to other neighboring arrays. These four sensor arrays C1, C2, C3 and C4 are designed to calculate eccentricity (X, Y) between the opening 3 and the cylindrical member 1. In other words, the eccentricity (X, Y) means the center of the cylindrical member 1. Sensor arrays C1, C2, C3 and C4 detect gaps a, b, c and d, respectively, between the cylindrical member 1 and the hollow member 2. A calculating means 4 calculates the eccentricity (X, Y) as follows:

(Image Omitted)

The result is shown by suitable means (not shown). The sensor arrays C5 and C6 are arranged in parallel and designed to measure the relative rotational angle between the cylindrical member 1 and the hollow member...