Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-07-10
1989-04-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250229, 250551, G01D 534
Patent
active
048250708
ABSTRACT:
A displacement detector in accordance with the present invention detects the amount of displacement of an object to be measured. Sensing means are arranged side by side with predetermined spacing whose states change in response to the changes in electromagnetic energy such as light energy, magnetic energy, and electrical energy. An electromagnetic energy generating means and an electromagnetic energy transmitting means that is linked to the motion of the object to be measured, transmits the electromagnetic energy from the electromagnetic energy generating means to the sensing means that is situated at the position that corresponds to the displacement of the object to be measured. A conversion unit ouputs the detection signal obtained from the sensing means as a displacement detection signal, by converting the detection signal to a coded signal that is characteristic of the position of the sensing means for the position where there was a change in the electromagnetic energy. A trouble shooting unit diagnoses malfunctions by examining whether or not the change in the displacement detection signal is within the range of specified values. A rotation number measuring unit counts the number of rotations of the object to be measured based on the detection signal from the sensing means, and a maximum value screening unit screens the maximum value from among the sensor outputs when the electromagnetic energy is incident upon a plurality of sensing means.
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"RO-64 Self-Scanned Circular Photodiode Array", Catalog of Reticon, by Reticon Corporation, 1974.
Kabushiki Kaisha Toshiba
Nelms David C.
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