The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1993
Filed:
Nov. 20, 1991
Shinzo Ito, Aichi, JP;
Akihiro Daito, Kariya, JP;
Nippondenso Co., Ltd., Kariya, JP;
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.