Interpolating encoder utilizing a frequency multiplier

Details Interpolating encoder utilizing a frequency multiplier Interpolating encoder utilizing a frequency multiplier

2007-08-28

2007-08-28

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Optical

Reexamination Certificate

active

11292961

ABSTRACT:
An encoder having a detector and an optical system that generates an image of a code strip on the detector is disclosed. The image includes a plurality of light and dark stripes, the detector generating a plurality of sinusoidal signals differing in phase from one another as the code strip moves relative to the detector. Each sinusoidal signal cycles through one period when the code strip moves a distance equal to one light stripe and one dark stripe with respect to the detector. A frequency multiplier generates a plurality of frequency multiplied signals. The encoder utilizes a signal interpolator that defines a plurality of position locations utilizing the frequency multiplied signals, there being at least 5 such points corresponding to the code strip moving a distance equal to one light stripe and one dark stripe with respect to the detector.

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Search Report dated Mar. 1, 2007 for the Patent Application In Great Britain No. 0623879.4.

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