Electromagnetic induction type encoder

Details Electromagnetic induction type encoder Electromagnetic induction type encoder

2011-03-15

2011-03-15

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

C324S207150

Reexamination Certificate

active

07906958

ABSTRACT:
The invention provides a highly accurate and inexpensive electromagnetic induction type encoder capable of acquiring strong signal intensity with the offset reduced by a short scale coil, and is durable against fluctuations in the yaw direction, which includes a number of scale coils14arrayed on a scale10along the measurement direction, and transmitting coils24and receiving coils20that are disposed on a grid12relatively movably in the measurement direction with respect to the scale, and which detects a relative movement amount of the scale and the grid from changes in magnetic fluxes detected by the receiving coils via the scale coil when the transmitting coils are magnetized, wherein a plurality of sets of the transmitting coils (24A,24B), the receiving coils (20A,20B) and the scale coils (14A,14B) are disposed symmetrically with respect to the center of the scale, and scale coils of one set located at a symmetrical position around the center of the scale is disposed with ½ phase of the scale pitch shifted with respect to scale coils of the other set.

REFERENCES:
patent: 2003/0080733 (2003-05-01), Miyata et al.
patent: 0 337 939 (1989-10-01), None
patent: A-10-318781 (1998-12-01), None
patent: A-2003-121206 (2003-04-01), None

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