Optical encoder and apparatus including the same | Optischer Codierer und Vorrichtung damit | Codeur optique et appareil le comprenant
|Erfinder:||Nakamura, Hitoshi (0)|
c/o CANON KABUSHIKI KAISHA; 30-2, Shimomaruko 3-chome, Ohta-ku, , Tokyo 146-8501, JP
Abstract / Hauptanspruch
|The optical encoder includes a scale (2) provided with a periodic pattern in which an optical portion is periodically formed with a first period in a first direction, and a light receiver (3) movable relatively with the scale in the first direction and photoelectrically converts a detection light from a light source (1) and then passing through the optical portions. The optical portion periodically has a pattern, which is formed by pattern portions mutually adjacent in a second direction orthogonal to the first direction and mutually shifted in the first direction, in the second direction with a second period of t. A width w of the light source in the second direction satisfies w= (a+b)/b·nt where n represents a natural number, and a:b represents a ratio of a distance from the light source to the periodic pattern and a distance from the periodic pattern to the light receiver.|
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