US 2003/0194034 A1 · Coincidence detection apparatus and method

Abstract

This invention is to allow accurate high-speed coincidence detection while preventing any increase in circuit scale. To achieve this object, a coincidence detection apparatus includes a detector which outputs at least two periodical signals in accordance with the displacement of an object, a digital interpolator which processes the periodical signal output from the detector at a predetermined time interval to generate a displacement or angle at a period shorter than the period of the periodical signal, a pulse generation unit which generates a constant frequency pulse signal, a counter which counts the pulse signal output from the pulse generation unit, and a pulse conversion unit which calculates a value to be set in the counter from the difference between displacement information corresponding to the target position of the object and the output from the digital interpolator.

Claims14

Dependent claims

A coincidence detection apparatus comprising:

a detector which outputs at least two periodical signals in accordance with one of a displacement and an angle of an object;
a digital interpolator which processes the periodical signal output from said detector at a predetermined time interval to generate one of a displacement and an angle at a period shorter than a period of the periodical signal;
a pulse generation unit which generates constant frequency pulses;
a counter which counts a pulse signal output from said pulse generation unit;
and
a pulse conversion unit which converts a difference between displacement information corresponding to a target position of the object and an output from said digital interpolator into a pulse of said pulse generation unit.

3 more elements

A coincidence detection method comprising:

a detection step of causing a detector which outputs at least two periodical signals in accordance with one of a displacement and an angle of an object to detect a displacement of the object;
a digital interpolation step of causing a digital interpolator which processes the periodical signal output in the detection step at a predetermined time interval to generate one of a displacement and an angle at a period shorter than a period of the periodical signal to process the periodical signal;
a pulse generation step of causing a pulse generation unit to generate constant frequency pulses;
a count step of causing a counter which counts a pulse signal output in the pulse generation step to count the pulse signal;
and
a pulse conversion step of converting a difference between displacement information corresponding to a target position of the object and an output from the digital interpolator into a pulse of the pulse generation unit.

3 more elements

Dependencies are inferred from the claim text.

Coincidence detection apparatus and method

Life of this patent

Coincidence detection apparatus and method

Life of this patent

Abstract

Claims14