Electromagnetic mark device for a magnetism encoder
US6687111B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2002 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Jul 30, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic mark device for any type of magnetism encoder applies the electric current magnetic field as the electromagnetic mark thereof. The electromagnetic mark device comprises an insulated base plate and a thin lead wire. The thin lead wire is fixed to the insulated base plate. It is characterized in that the thin lead wire is laid out on the base plate as a circuit in a way of providing a continuously twisted and turned shape with a constant pitch. Hence, alternate magnetic marks are formed with continuous magnetic poles N·S·N·S once the current passes the lead wire. The electromagnetic mark device can be adapted to a linear ruler or a rotary dial in the magnetism encoder to detect a relative displacement, velocity and angular velocity of a moving object so that the present invention can offer more stable signals and more accurate detection of location with being fabricated more easily.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.