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1. WO1996028707 - POSITION MEASURING INSTRUMENT

Publication Number WO/1996/028707
Publication Date 19.09.1996
International Application No. PCT/JP1996/000583
International Filing Date 08.03.1996
Chapter 2 Demand Filed 12.07.1996
IPC
G01D 5/245 2006.01
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
244influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
245using a variable number of pulses in a train
G01V 8/10 2006.01
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
8Prospecting or detecting by optical means
10Detecting, e.g. by using light barriers
CPC
G01D 5/2451
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
244influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
245using a variable number of pulses in a train
2451Incremental encoders
G01V 8/10
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
8Prospecting or detecting by optical means
10Detecting, e.g. by using light barriers
Applicants
  • SEFT DEVELOPMENT LABORATORY CO., LTD. [JP]/[JP] (AllExceptUS)
  • ICHIGAYA, Hiroshi [JP]/[JP] (UsOnly)
Inventors
  • ICHIGAYA, Hiroshi
Agents
  • HANDA, Masao
Priority Data
7/14533919.05.1995JP
7/18899225.07.1995JP
7/7981610.03.1995JP
8/1348030.01.1996JP
8/1348130.01.1996JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) POSITION MEASURING INSTRUMENT
(FR) INSTRUMENT DE MESURE DE POSITIONS
Abstract
(EN)
A position measuring instrument comprising photodetector means including linear arrays, each containing the same number of detector elements at regular intervals; and light source means for irradiating the photodetector means. The light source means includes variations, such as a single light source system, a multiple light source system, a minute difference system, an interference system and an in interference minute difference system. The outputs from the corresponding detector elements of the arrays are summed and the results are arranged at regular intervals to obtain a periodic function. The relative position between the photodetector means and the light source means in the actual space can be precisely determined by calculating the phase of this periodic function.
(FR)
Cette invention concerne un instrument de mesure de positions se composant, d'une part, d'un système de photodétecteurs, lequel comprend des réseaux linéaires contenant chacun un même nombre d'éléments de détection placés à intervalles réguliers, et, d'autre part, d'une source lumineuse afin d'irradier le système de photodétecteurs. Le système de source lumineuse comporte plusieurs versions possibles, tel qu'un système de sources lumineuses individuelles, un système de sources lumineuses multiples, un système à faible différence, un système à interférences et un système à faible différence et à interférences. Les données de sortie provenant des éléments de détection correspondants des réseaux sont ensuite additionnées et les résultats sont agencés à intervalles réguliers afin d'obtenir une fonction périodique. La position relative dans l'espace réel entre le système de photodétecteurs et le système de source lumineuse peut être définie avec précision par calcul de la phase de cette fonction périodique.
Also published as
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