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:
Nov. 25, 1986
Filed:
Feb. 28, 1985
Hermann Zierhut, Munich, DE;
Richard Hirschmann Radiotechnisches Werk, Esslingen am Neckar, DE;
Abstract
A motion detector with at least one sensor to receive electromagnetic radiation, in particular in the infrared range, from a radiation receiver surrounding a monitored object at least partially, and with an evaluating circuit to trigger a control signal upon a change in the intensity of the radiation. A motion detector of this type may be manufactured cost effectively and is suitable for the reception of electromagnetic radiation from an angular range of up to 360.degree. of closed fields of sensitivity because the closed field or fields of sensitivity are formed by the shape of the sensor or sensors. In an embodiment of the invention that is particularly secure from interference, two sensors operating in a push-pull manner are provided, the fields of sensitivity of which are successive to each other in a path to the optical device, whereby the evaluating circuit emits a control signal only when within a predetermined period of time both a positive and a negative voltage pulse are present at the outlet of the radiation receiver.