Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-11-20
1993-12-14
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534
Patent
active
052705390
ABSTRACT:
For non-contact measurement of the quantity of movement, such as the quantity of injection from a car diesel injection pump, a slit plate having a plurality of slits different in shape from each other is provided so as to be movable in predetermined directions with the movement of a position detection target portion. A measurement wave is radiated toward the slit plate, and the presence of reception of the measurement wave passing through the slits is detected on a receiving surface wider than the width of the slits in a direction of movement. The distance between a reception boundary and an end portion of the receiving surface is measured. A slit through which the measurement wave is passing is specified. The relation of the quantity of movement of the reception boundary from a reference position is calculated for every slit in advance, and the quantity of movement from the reference position is detected on the basis of the measured distance of the reception boundary and the specified slit.
REFERENCES:
patent: 4950891 (1990-08-01), Matsui
patent: 4988865 (1991-01-01), Schmidt et al.
patent: 5068529 (1991-11-01), Ohno et al.
Daito Akihiro
Ito Shinzo
Allan Stephone B.
Nelms David C.
Nippondenso Co. Ltd.
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