Optical detection apparatus and method
AssigneeArima Lasers Corp.
InventorMing-Cho WU
Life of this patent
Estimating the term…
Abstract
An optical detection apparatus includes a scanning device, a sensor, and a distinguishing module. The scanning device is positioned to scan a detection region with a scan light beam, in which the incident angle of the scan light beam varies with time. The sensor is positioned to sense a plurality of reflected scan light beams respectively generated by a plurality of actual touches within the detection region. The distinguishing module is operative to distinguish the actual touches from a plurality of ghost touches according to time signals upon which the plurality of reflected scan light beams are sensed by the sensor.
Claims17
An optical detection apparatus comprising:
- a scanning device positioned to scan a detection region with a scan light beam, in which the incident angle of the scan light beam varies with time;
- a sensor positioned to sense a plurality of reflected scan light beams respectively generated by a plurality of actual touches within the detection region;
- and
- a distinguishing module operative to distinguish the actual touches from a plurality of ghost touches according to time signals upon which the plurality of reflected scan light beams are sensed by the sensor.
An optical detection apparatus comprising:
- a planar light source positioned to provide a planar light to a detection region such that the planar light is reflected by a plurality of actual touches within the detection region;
- a first linear sensor positioned to sense the reflected lights;
- an imaging device positioned to focus the reflected lights onto the first linear sensor and forms a plurality of images;
- a scanning device positioned to scan the detection region with a scan light beam, in which the incident angle of the scan light beam varies with time, and the scan light beam is reflected by the actual touches;
- a second linear sensor positioned to sense the reflected scan light beams;
- a location processing module operative to determine the locations of the actual touches and a plurality of ghost touches according to the incident angles of the reflected lights and the reflected scan light beams by way of triangulation;
- and
- a distinguishing module operative to distinguish the actual touches from The ghost touches according to time signals upon which the reflected scan light beams are sensed by the second linear sensor.
An optical detection method comprising:
- scanning a detection region with a scan light beam, in which the incident angle of the scan light beam varies with time;
- sensing a plurality of reflected scan light beams respectively generated by a plurality of actual touches within the detection region;
- and
- distinguishing the actual touches from a plurality of ghost touches according to time signals upon which the reflected scan light beams are sensed.
Dependencies are inferred from the claim text.