Optical positional encoder comprising immediately

专利名称：Optical positional encoder comprising

immediately adjacent detectors

发明人：Mark G. Leonard申请号：US06/747084申请日：19850619公开号：US04691101A公开日：19870901

摘要：An optical shaft encoder has a light detector configuration that includes thefunction of a phase plate. The light detectors are one- half the width of a code wheeltransmissive section and are arranged in groups of four so that each group correspondsto one pitch of the code wheel. The light detectors are interdigitated such that they areadjacent to one another and receive information from two channels. One light beamilluminates the four light detectors producing four electrical signals. The physical layoutof the light detectors causes the output signals to be phase shifted 90° from each other.These signals are combined electronically in pairs forming quadrature push pull signals.

申请人：HEWLETT-PACKARD COMPANY

代理人：Saundra S. Hand,Douglas A. Kundrat

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