| 摘要 |
An optical encoder whose light utilization efficiency is high and which can be manufactured easily. The encoder is provided with a converting element (7) having lens elements (71, 72) periodically arranged at predetermined pitches IP so as to convert a luminous flux L from a light source into a plurality of moving luminous fluxes MF. The luminous flux L is collimated to a half of the pitch IP by means of the element (7), emitted as a parallel luminous flux having a width IP/2, and made incident on a light receiving section (4). On the substrate (41) of the section (4), light receiving elements (42) are arranged at pitches of IP/2. When an object coupled to the converting element (7) rotates or translates, the positions of the lens element (71, 72) synchronously change and the array of the light receiving elements (42) is scanned with the moving luminous fluxes MF. As a result, the proportion of the quantity of light arriving at the elements (42) periodically changes. Obtained electric signals are processed by means of a well-known processing circuit.
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