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US 5,013,988 AGranted
Absolute position encoder
AssigneeFanuc Corporation
InventorTetsuro Sakano
Life of this patent
Estimating the term…
Abstract
An absolute position encoder outputs position data as absolute data. When a power supply is turned on, absolute position data is read from an absolute code pattern (6) and is set in a counter (14). Thereafter, the counter (14) effects counting of incremental pulses read from an incremental code pattern (7) and increments the contents of the counter (14). Accurate absolute data referenced upon startup to the absolute code pattern can thus be output even during a high speed rotation.
Claims9
An apparatus for position encoding, said apparatus comprising:
- a code encoder to output an absolute code and an incremental code, the incremental code output in a set of at least one incremental code signal;
- a position indicator to updata an indicated position by a predetermined value for every predetermined set of at least one incremental code signal output by said code encoder;
- and
- a reset circuit to set the indicated position of the position indicator to a value representative of the absolute code output by said code encoder when a power-up occurs.
1 more element
A method of position encoding, said method comprising the steps of:
- (a) indicating and outputting from a code encoder an absolute code and an incremental code, the incremental code output in a set of at least one incremental code signal;
- (b) updating an indicated position by a predetermined value for every predetermined set of at least one incremental code signal output of the code encoder;
- and
- (c) setting the indicated position to a value representative of the absolute code output by the code encoder when a reset occurs upon a power-up.
1 more element
Dependencies are inferred from the claim text.