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Position sensing device and position sensing method

  • US 10,151,575 B2
  • Filed: 04/05/2016
  • Issued: 12/11/2018
  • Est. Priority Date: 04/10/2015
  • Status: Active Grant
First Claim
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1. A position sensing device comprising:

  • at least one light receiver that receives lights that are emitted from a plurality of light exit positions of a scanning light source component exclusively in time series to scan a predetermined area and are reflected by a sensing object within the predetermined area; and

    a processor that controls the scanning light source component to emit the lights from the light exit positions exclusively in time series, and senses position of the sensing object based on a light reception signal of the light receiver,the processor further determining from which of the lights the light reception signal is obtained, and sensing the position of the sensing object by calculating a closest point of optical paths of the lights, with the optical paths being defined between the light exit positions and the sensing object, respectively,the scanning light source component includingat least one light source that emits light,at least one scanning light generator that moves optical path of the light from the light source in a first direction and in a second direction that intersects the first direction,an optical path switching component that alternately guides the optical path of the light to the light exit positions, anda polarization switching component that is disposed between the light source and the scanning light generator and switches a polarization direction of the light,the processor controlling the light source and the scanning light generator, andthe optical path switching component including a polarized beam splitter that is disposed between the scanning light generator and the light exit positions and selectively guides the optical path of the light to the light exit positions by reflecting or transmitting the light according to the polarization direction of the light.

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