Eye-position sensor
First Claim
Patent Images
1. In an eye-position sensor which provides a signal representative of the X and Y coordinates of light reflected from the cornea of an eye;
- said eye-position sensor comprising;
a substantially point source of light for illuminating the eye; and
a light sensor including;
a quadrantal array of contiguous photo detectors each of which generates a signal which is proportional to the illuminated area thereof;
a lens for collimating the light from the point source of light reflected from the cornea of the eye, onto the quadrantal array of contiguous photo detectors;
said light sensor characterized by;
a spatial filter for providing a substantially rectangular pattern of light from said source which is specularly reflected from the eye onto the array so that each corner of the rectangular pattern lies in a different quadrant of the array;
the filter being disposed so that movement of the eye changes the position of the pattern illuminating the array.
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Abstract
An eye-position sensor for use in an eye-activated optical transducer in which a spatial filter is used to modify light reflected from the eye to form a substantially rectangular pattern on a quadrantal array of contiguous sensors. This arrangement provides a substantially linear change in the output signal from the sensors in response to an equivalent movement of the eye.
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Citations
7 Claims
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1. In an eye-position sensor which provides a signal representative of the X and Y coordinates of light reflected from the cornea of an eye;
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said eye-position sensor comprising; a substantially point source of light for illuminating the eye; and a light sensor including; a quadrantal array of contiguous photo detectors each of which generates a signal which is proportional to the illuminated area thereof; a lens for collimating the light from the point source of light reflected from the cornea of the eye, onto the quadrantal array of contiguous photo detectors; said light sensor characterized by; a spatial filter for providing a substantially rectangular pattern of light from said source which is specularly reflected from the eye onto the array so that each corner of the rectangular pattern lies in a different quadrant of the array; the filter being disposed so that movement of the eye changes the position of the pattern illuminating the array. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification