Eccentricity measuring method and eccentricity measuring apparatus
First Claim
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1. An eccentricity measuring method, comprising:
- a first moving step of moving a surface to be tested relative to an optical system along a measurement reference axis;
projecting an index to an apparent spherical center position of at least the surface to be tested through the optical system;
a second moving step of moving the surface to be tested relative to the optical system in a direction perpendicular to the measurement reference axis based on a position of a reflection image which is obtained by reflecting an image of the index by the surface to be tested;
using a sensor to detect a value of a relative movement quantity between the surface to be tested and the optical system in the direction perpendicular to the measurement reference axis; and
calculating an eccentric quantity of the surface to be tested as a function of the value of the relative movement quantity between the surface to be tested and the optical system in the direction perpendicular to the measurement reference axis.
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Abstract
A surface to be tested and an optical system for projecting an index to an apparent spherical center position of the surface to be tested are moved relative to each other and an eccentric quantity of the surface to be tested is calculated from an movement quantity. A focal distance of an optical system is changed according to an apparent radius of curvature of each surface to be tested, which is calculated in advance. A reflection image on a surface to be tested, which is to be measured, is determined from the apparent radius of curvature of each surface to be tested, which is calculated in advance. Thus, an eccentric quantity of the entire lens system is accurately measured.
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5 Claims
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1. An eccentricity measuring method, comprising:
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a first moving step of moving a surface to be tested relative to an optical system along a measurement reference axis; projecting an index to an apparent spherical center position of at least the surface to be tested through the optical system; a second moving step of moving the surface to be tested relative to the optical system in a direction perpendicular to the measurement reference axis based on a position of a reflection image which is obtained by reflecting an image of the index by the surface to be tested; using a sensor to detect a value of a relative movement quantity between the surface to be tested and the optical system in the direction perpendicular to the measurement reference axis; and calculating an eccentric quantity of the surface to be tested as a function of the value of the relative movement quantity between the surface to be tested and the optical system in the direction perpendicular to the measurement reference axis. - View Dependent Claims (2, 3, 4, 5)
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Specification