基準信号を検出可能な光ファイバ干渉型格子エンコーダ

Japanese Patent JP5693840

B2

A reference mark configuration for an interferometric miniature grating encoder readhead using fiber optic receiver channels is provided. The readhead includes "primary" fibers that provide reference mark primary signals processed to generate a reference signal with accuracy of approximately 0.2 microns. The readhead may include "secondary" fibers used to generate reference mark secondary signals processed to generate a reference signal with accuracy of approximately 20 nanometers. Spatial filter masks configured for the secondary fiber optic receiver channels provide two spatially periodic secondary signals arising from interference fringes outside of the receiving area of the primary fiber optic receiver channels. The secondary signals are out of phase with one another and their spatial frequency is higher than that of the primary signals. A signal crossing of the reference mark secondary signals is identified that is spatially adjacent to a signal crossing of the reference mark primary reference signals.

JP4804819	Encoder, rotation speed detection device, movement speed detection device, rotation angle detection device, movement position detection device, rotation direction detection device, movement direction detection device, jog dial, and switch
JP7196305	Auto racing footwear motor with rotary drum encoder

Abron M Twilling
Joseph Dito Biasson
Scott Hashira
Carl Gee Mallerie

JP2009265460A

April 01, 2015

November 20, 2009

Click for automatic bibliography generation  

Mitutoyo Corporation

G01D5/347; G01D5/38

JP2009031279A
JP2005283357A
JP10332431A
JP2004333470A
JP56014112A
JP9021654A
JP2005106827A
JP2007232681A

Satoshi Takaya
Keisuke Matsuyama
Tsuyoshi Makino

Previous Patent: 走行車両

Next Patent: JPS5693841