Optical position detecting device and recording medium
First Claim
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1. An optical position detecting device comprising:
- a light retro-reflector provided outside a predetermined region;
at least two optical transceivers, each including an optical scanning unit for angularly scanning light in a plane substantially parallel to the predetermined region and a light receiving unit for receiving reflected light from a portion of said light retro-reflector irradiated with the scanning light;
a detector for detecting a position of a light blocking object present in a region optically scanned by said optical scanning units, based on scanning angles of said optical scanning units and results of receiving light by said light receiving units; and
a cover for covering said optical transceivers, said optical position detecting device being characterized by further comprising;
a measuring unit for measuring a base potential of a light receiving signal in said light receiving unit;
a comparing unit for comparing the measured base potential with a predetermined potential; and
a judging unit for making a judgment that said cover is dirty when the measured base potential is higher than the predetermined potential.
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Abstract
The position of a light blocking object is detected not only within a display screen, but also outside the display screen. With the use of the function of detecting the position in a region outside the display screen, it becomes possible to provide virtual buttons in this region and detect dust around a light retro-reflector. Dirt on the light retro-reflector is detected based on the levels of light receiving signals of optical units.
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1 Claim
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1. An optical position detecting device comprising:
- a light retro-reflector provided outside a predetermined region;
at least two optical transceivers, each including an optical scanning unit for angularly scanning light in a plane substantially parallel to the predetermined region and a light receiving unit for receiving reflected light from a portion of said light retro-reflector irradiated with the scanning light;
a detector for detecting a position of a light blocking object present in a region optically scanned by said optical scanning units, based on scanning angles of said optical scanning units and results of receiving light by said light receiving units; and
a cover for covering said optical transceivers, said optical position detecting device being characterized by further comprising;
a measuring unit for measuring a base potential of a light receiving signal in said light receiving unit;
a comparing unit for comparing the measured base potential with a predetermined potential; and
a judging unit for making a judgment that said cover is dirty when the measured base potential is higher than the predetermined potential.
- a light retro-reflector provided outside a predetermined region;
Specification
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Current AssigneeFujitsu Limited
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Original AssigneeFujitsu Limited
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InventorsIwamoto, Yasuhide, Sano, Satoshi, Nakazawa, Fumihiko, Yamaguchi, Nobuyasu
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Primary Examiner(s)Allen, Stephone B.
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Application NumberUS10/848,006Publication NumberTime in Patent Office230 DaysField of Search250/221, 250/222.1, 345/156, 345/157, 345/158, 345/166, 345/173, 345/175, 345/176US Class Current250/221CPC Class CodesG02B 5/124 plural reflecting elements ...G06F 3/0423 using sweeping light beams,...
