Visual axis detection apparatus
Patent 5280312 Issued on January 18, 1994. Estimated Expiration Date: 
January 22, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 22, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.InventorsAssigneeApplicationNo. 823773 filed on 01/22/1992US Classes:351/211, Including projected target image351/200, EYE EXAMINING OR TESTING INSTRUMENT351/205Objective typeExaminersPrimary: Arnold, Bruce Y.Assistant: Dang, Hung Xuan Attorney, Agent or FirmForeign Patent References
International ClassA61B 003/10Foreign Application Priority Data1991-01-22 JPAbstractA visual axis detection apparatus in which an eye of an observer is illuminated by a light source, and the corneal reflection image of the eye and the reflected image of the iris are detected by a light sensor. By the utilization of the position information of each reflected image from the sensor, the visual axis of the eye is calculated by a calculator. The light sensor has a plurality of photoelectric elements, and the calculator utilizes the position information of one of a plurality of photoelectric elements which produces the smallest output signal to detect the reflected image of iris on the basis of the signal from the light sensor. | |
