Title:
多重トラック位置エンコーダシステム
Document Type and Number:
Japanese Patent JP4195519
Kind Code:
B2
Abstract:
A position encoder system is provided, such system including a code wheel, a pair of sensors, a counter, and a processor capable of identifying the correlation between separately identified markings of the code wheel. The identified correlation is indicative of code wheel accuracy, and thus is used to correct error in any angular position determined using the code wheel. A method of identifying position of the code wheel thus includes: (1) providing a disc including a first track having incremental markings of a first resolution and a second track having incremental markings of a second resolution; (2) providing a first sensor to identify markings along the first track; (3) providing a second sensor to identify markings along the second track; (4) quantifying markings of the second track during a predetermined movement of the disc; (5) identifying eccentricity by determining a difference between the quantified number of markings and a predetermined desired quantity of markings; and (6) adjusting the identified relative angular position based on the corresponding identified eccentricity.
More Like This:
Inventors:
Eugene A. Cooper
Stephen B. Elsey
Stephen B. Elsey
Application Number:
JP994398A
Publication Date:
December 10, 2008
Filing Date:
January 21, 1998
Export Citation:
Assignee:
HEWLETT-PACKARD COMPANY
International Classes:
G01B11/26; G01D5/245; G01D5/244; H03M1/10; H03M1/30
Domestic Patent References:
| JP4086521A | ||||
| JP3226626A | ||||
| JP3042518A |
Attorney, Agent or Firm:
Satoshi Furuya
Kaoru Furuya
Takahiko Mizobe
Kaoru Furuya
Takahiko Mizobe