Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-09-02
1978-07-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
235 92GC, 250231R, H01J 314
Patent
active
041017641
ABSTRACT:
An incremental measuring instrument having a series of fixed reference marks along one edge of the grid scale is disclosed in which a series of movable magnets are located along the opposite edge of the grid scale so that a magnet may be associated with each reference mark which is needed for control purposes in the particular application in which the system is being used. The magnets are movably mounted so that reference marks not needed for control purposes in any specific application do not have magnets associated with them. An electric switch, preferably a magnetically actuated Reed switch, is also provided in the system's sensor head. Electrical impulses generated by the magnets and the switch are transmitted to an electronic comparator along with electric impulses generated when the sensor head passes over the reference marks. This electronic comparator is connected to the system's electronic control counter and its logic circuitry is such that a reference mark impulse is only transmitted to the control counter when an impulse is simultaneously fed to the comparator by the switch associated with the magnets.
REFERENCES:
patent: 3024986 (1962-03-01), Strianese et al.
patent: 3142121 (1964-07-01), Stefanov
patent: 3591841 (1971-07-01), Heitmann
patent: 3663803 (1972-05-01), Mohan et al.
patent: 3982106 (1976-09-01), Stutz
patent: 4012623 (1977-03-01), Fleisher
Dr. Johannes Heidenhain GmbH
Nelms David C.
Sunderdick Vincent J.
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