Optics: measuring and testing – Angle measuring or angular axial alignment
Patent
1976-08-23
1977-10-18
Corbin, John K.
Optics: measuring and testing
Angle measuring or angular axial alignment
250237R, 350160LC, 356156, 356170, 356172, G01B 1100
Patent
active
040543854
ABSTRACT:
Apparatus for determining the position on a plane surface where a beam of light strikes the surface in relation to a datum position. In one embodiment the apparatus comprises a liquid crystal device having a common, transparent electrode on one surface and a plurality of spaced, parallel, segmental, transparent electrodes on the other surface to define a corresponding plurality of liquid crystal cells. Means is provided for changing the light-transmission characteristics of the liquid-crystal cells in a predetermined sequence from a datum position. Means is provided for directing a beam of light towards the liquid-crystal device from one side of the device and a detector positioned on the other side of the device is arranged to detect a change in the light-level of the beam transmitted through the liquid-crystal device when the light-transmitting characteristic of a cell receiving the beam is changed to provide a detector output signal and an indicator responsive to the detector output signal provides an indication of the cell receiving the beam, thereby providing an indication of the position on the surface of the liquid-crystal device struck by the beam.
REFERENCES:
patent: 3649122 (1972-03-01), Holtz
patent: 3800148 (1974-03-01), DeCock
patent: 3894230 (1975-07-01), Rorden et al.
Bell & Howell Limited
Corbin John K.
Myers Richard L.
Rosenberger R. A.
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