| 摘要 |
Rotary encoder apparatus is described that comprises one or more readheads (114) and a radial scale (20). Each of the one or more readheads (114) includes a light emitting portion (30, 32) for illuminating the radial scale and a light detecting portion (40, 42) for detecting interference fringes formed at a readhead analyser plane (AP). The readhead analyser plane (AP) is tilted relative to the plane containing the radial scale (20). In a preferred, embodiment, the readhead analyser plane (AP) is tilted towards the centre of rotation (112) of the rotary encoder apparatus by the angle (beta).
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