Geometrical instruments – Area integrators – Electrical
Patent
1978-01-24
1979-05-01
Haroian, Harry N.
Geometrical instruments
Area integrators
Electrical
G01B 728
Patent
active
041516540
ABSTRACT:
In a device for measuring axially symmetric aspherics which has means for mounting the aspherics thereon and means having an axis of rotation orthogonal to the axis of symmetry of the aspherics and passing through the center of curvature of the approximately tangential spherical plane of the aspherics, the means being for swinging the mounting means so that the aspherics swings within a predetermined angle about the axis of rotation, there is provided means for continuously detecting the angle of swing of the aspherics, slidable means displaceable in a direction orthogonal to the axis of rotation, fine displacement detecting means having a detecting head making a point-contact with the aspherics, the detecting means being disposed between the aspherics and the slidable means for detecting any variation in the distance between the point of contact and the slidable means, drive means for displacing the slidable means, the amount of drive of the drive means being determined in accordance with an input signal thereto, control means coupled to the angle-of-swing detecting means for pre-memorizing the amount of separation from the approximately tangential spherical plane at each point on the aspherics and for generating a signal to the drive means so as to displace the slidable means by an amount equal to the memorized amount of separation at the point of contact with the detecting head corresponding to the detected angle of swing, and means for displaying the variation in the distance detected by the fine displacement detecting means.
REFERENCES:
patent: 965211 (1910-07-01), Moe
patent: 3481043 (1969-12-01), Esch
Haroian Harry N.
Nippon Kogaku K.K.
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