Position detector for maintaining a fixed distance between two o

Details Position detector for maintaining a fixed distance between two o Position detector for maintaining a fixed distance between two o

1990-11-05

1992-11-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502015, 356375, G01N 2186

Patent

active

051626616

ABSTRACT:
A position detector includes: light emitting component for irradiating the surface of an object to be measured; two light receiving components for receiving light reflected by the measured surface, a distance from one of the light receiving components to the measured surface as viewed in a direction substantially perpendicular to the surface being different from a distance from the other of the light receiving components to the surface; calculating circuit for calculating a correction quantity for correcting the distances between the light receiving components and the surface, with the correction quantity being calculated on the basis of a difference between the output signals of the light receiving components; and, moving component for correcting the distances between the measured surface and the light receiving components in accordance with the correction quantity. A first embodiment has two light receiving components each spaced at different distances from the surface. A second embodiment has two light receiving components disposed between two light emitting components, or two light emitting components disposed between two light receiving components. A third embodiment has two light receiving components spaced at a same distance from the surface, but each spaced at different distances from a light emitting components.

REFERENCES:
patent: 4358960 (1982-11-01), Porter
patent: 4412746 (1983-11-01), Yokouchi
patent: 4488813 (1984-12-01), Kissinger et al.
patent: 4670659 (1987-06-01), Loose
patent: 4711577 (1987-12-01), Hull-Allen
patent: 4798964 (1989-01-01), Schmalfuss et al.
patent: 4807212 (1989-02-01), Kaneda et al.
patent: 4899061 (1990-02-01), Van Hoek et al.

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