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We propose a method to improve the resolution of a linear encoder by optimizing the design of the photo detector cell pitch. High-performance optical encoders generally achieve high resolution by electrically dividing the sinewave-shaped output signal of the photo detector. In a linear encoder, resolution is determined by the amplitude from the photo detector. However, the slit pitch of the projection image on a photo detector is larger than photo detector cell since the influence of the oblique directional light from the LED, the amplitude of the output signal from the encoder's photo detector is decreased. This, in turn, decreases the resolution of the linear encoder. This paper describes an optimized design method using an optical system simulator of the linear encoder. To confirm this method, we evaluated the resolution of an actual linear encoder using the optimized photo detector. From this, we found a 30% improvement in the resolution of the linear encoder.

Optimized design of photo detector cell pitch of linear encoder to improve resolution