Abstract: The optical system of an optical rotary encoder is presented. The requirements of the optics system are given and their effects on optical design decisions are discussed. Steps taken to insure stable operation over aa minus 40 degree Celsius to plus 85 degree Celsius temperature range are presented. Designing for manufacturing tolerances is discussed. A novel application of a fiber illuminator LED as a short-distance collimated source is shown to be an acceptable low-cost alternative to a laser diode. The importance of effective plastic element employment in low- cost, mass-production optical systems is demonstrated. !0
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