Position sensing device and position sensing method
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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Abstract
A position sensing device includes at least one light receiver, and a processor. The light receiver receives lights that are emitted from a plurality of light exit positions of a scanning light source component to scan a predetermined area and are reflected by a sensing object within the predetermined area. The processor controls the scanning light source component, and senses position of the sensing object based on a light reception signal of the light receiver. The processor further determines from which of the scanning lights the light reception signal is obtained, and senses the position of the sensing object based on optical paths of the scanning lights.
14 Citations
18 Claims
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1. A position sensing device comprising:
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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 including at 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, and a 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, and the 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. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12, 13, 14)
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6. A position sensing device comprising:
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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 including at 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, and an optical path switching component that alternately guides the optical path of the light to the light exit positions, the processor controlling the light source and the scanning light generator, and the optical path switching component including a reflection member that has a reflective face that selectively reflects the light to a plurality of reflectors according to incidence position of the light on the reflective face in the first direction. - View Dependent Claims (7, 8, 9)
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15. A position sensing method comprising:
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emitting lights from a plurality of light exit positions of a scanning light source component exclusively in time series to scan a predetermined area; receiving, by at least one light receiver, the lights that are reflected by a sensing object within the predetermined area; controlling the scanning light source component to emit the lights from the light exit positions exclusively in time series; and sensing position of the sensing object based on a light reception signal in response to the receiving of the lights, the sensing of the position further including 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 controlling of the scanning light source component including controlling at least one light source to emit light, and controlling at least one scanning light generator to move optical path of the light from the light source in a first direction and in a second direction that intersects the first direction, the emitting of the lights from the light exit positions including alternately guiding, by an optical path switching component, the optical path of the light to the light exit positions, and switching, by a polarization switching component that is disposed between the light source and the scanning light generator, a polarization direction of the light, and the alternately guiding of the optical path of the light to the light exit positions including selectively guiding, by a polarized beam splitter of the optical path switching component that is disposed between the scanning light generator and the light exit positions, 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. - View Dependent Claims (16, 17, 18)
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Specification