Environmentally safe touch typing keyboard
First Claim
1. A keyboard for data entry that the positional detection of an operators fingers are made prior to said operators fingers contacting said keyboard, the keyboard further comprising in combination:
- a planar surface forming a substantially flat bottom of an unilocular area;
a removable overlay with opaque indicia thereon, disposed on said planar surface;
said opaque indicia being at a plurality of discrete locations disposed in a pattern for indicating key text at each of said plurality of discrete locations;
a plurality of light emitters and a plurality of light detectors disposed in a pattern about a border surrounding said plurality of discrete locations and above said planar surface;
said plurality of light emitters are paired with said plurality of light detectors;
an electronic circuit that illuminates said light emitters to emit light in a path substantially straight to said light detectors, and to scan said pair of light emitters and light detectors in an unimpeded path above and substantially parallel to and coextensive with said planar surface;
a printed circuit board disposed adjacent to and below said planer surface, connecting said electronic circuit to said plurality of light emitters and said plurality of light detectors; and
means for scanning said pair of light emitters and light detectors to detect said operators fingers that break said path of said pair of light emitters and light detectors before said operators finger contacts said planar surface at each of said plurality of discrete locations.
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Accused Products
Abstract
A keyboard that has two adjacent rows of emitters opposed by two adjacent rows of detectors that is environmentally sealed and has no moving parts. This said keyboard has a field changeable coded indicia so a scan pattern, ambient reference level or other application specific variables can be changed without breaking the environmental seal or powering down the keyboard. Further, the different said scan patterns can include scanning the finger position by multiple emitter detector pairs at angles other than ninety degrees to give a cross check on detection. These said scan patterns can be further optimized to scan angled sets of keys and to adjust to different ambient light conditions so errors can be detected by the emitter detector pair closest to detection of a finger. Also another said scan pattern can include, that both emitter detector pairs before and after the detected finger position must show a no finger detection condition to be a valid finger detection. This said keyboard can also use one value of feedback gain to check ambient light and a different value to detect a finger by the same detectors scanning the keyboard.
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Citations
25 Claims
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1. A keyboard for data entry that the positional detection of an operators fingers are made prior to said operators fingers contacting said keyboard, the keyboard further comprising in combination:
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a planar surface forming a substantially flat bottom of an unilocular area; a removable overlay with opaque indicia thereon, disposed on said planar surface; said opaque indicia being at a plurality of discrete locations disposed in a pattern for indicating key text at each of said plurality of discrete locations; a plurality of light emitters and a plurality of light detectors disposed in a pattern about a border surrounding said plurality of discrete locations and above said planar surface; said plurality of light emitters are paired with said plurality of light detectors; an electronic circuit that illuminates said light emitters to emit light in a path substantially straight to said light detectors, and to scan said pair of light emitters and light detectors in an unimpeded path above and substantially parallel to and coextensive with said planar surface; a printed circuit board disposed adjacent to and below said planer surface, connecting said electronic circuit to said plurality of light emitters and said plurality of light detectors; and means for scanning said pair of light emitters and light detectors to detect said operators fingers that break said path of said pair of light emitters and light detectors before said operators finger contacts said planar surface at each of said plurality of discrete locations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A keyboard for data entry that the positional detection of an operators fingers are made prior to said operators fingers contacting said keyboard, the keyboard further comprising in combination:
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a planar surface forming a substantially flat bottom of an unilocular area with indicia on said planar surface at a plurality of discrete locations disposed in a pattern for indicating key text at each of said plurality of discrete locations; a plurality of light emitters and a plurality of light detectors disposed in a pattern about a border surrounding said plurality of discrete locations and above said planar surface; said plurality of light emitters are paired with said plurality of light detectors; an electronic circuit that illuminates said light emitters to emit light in a path substantially straight to said light detectors, and to scan said pair of light emitters and light detectors in an unimpeded path above and substantially parallel to and coextensive with said planar surface; a printed circuit board disposed adjacent to and below said planer surface, connecting said electronic circuit to said plurality of light emitters and said plurality of light detectors; and means for scanning said pair of light emitters and light detectors to detect said operators fingers that break said path of said pair of light emitters and light detectors before said operators finger contacts said planar surface at each of said plurality of discrete locations. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification