초록 ▼

An ultrasonic transducer unit for web edge detection includes multiple transducer elements attached to a single sound conducting plate. The transducer elements are preferably piezoelectric disks, and the sound conducting plate is preferably formed of hollow glass microspheres in an epoxy matrix. Mul

An ultrasonic transducer unit for web edge detection includes multiple transducer elements attached to a single sound conducting plate. The transducer elements are preferably piezoelectric disks, and the sound conducting plate is preferably formed of hollow glass microspheres in an epoxy matrix. Multiple transducer elements may be positioned on the sound conducting plate in various geometric arrangements. Transducer units in accordance with the present invention may be mounted in a web edge detector head, such that pairs of transmitting and receiving transducer elements face each other across a detection gap through which a web of material is passed. Individual transducer elements within each transducer unit are activated to transmit/receive an ultrasonic beam in a selected pattern to provide both web edge sensing and ultrasonic signal compensation for varying ambient conditions in the detection gap. Each transducer unit may include a spacer attached to the sound conducting plate and surrounding the transducer elements, and a sealing plate attached to the spacer to enclose the transducer elements within the transducer unit. Transducer element control circuits may be mounted on a portion of the sealing plate which forms a circuit board that is electrically connected to the transducer elements and to a main controller external to the detector head.

대표청구항 ▼

[ What is claimed is:] [1.] A detector head for ultrasonic web edge detection, comprising:(a) a detector head frame having two arms extending from a base and separated by a gap into which a web of material can pass;(b) a sound conducting plate made of a sound conducting material and having an outer

[ What is claimed is:] [1.] A detector head for ultrasonic web edge detection, comprising:(a) a detector head frame having two arms extending from a base and separated by a gap into which a web of material can pass;(b) a sound conducting plate made of a sound conducting material and having an outer surface and an inner surface mounted in each of the arms such that the outer surfaces of the sound conducting plates face each other across the gap;(c) a plurality of ultrasonic transducer elements mounted to the inner surface of each sound conducting plate and arranged on the sound conducting plates such that an ultrasonic signal produced by an ultrasonic transducer element in one of the arms of the detector head is receivable by a corresponding ultrasonic transducer element in the other arm of the detector head.