Visual axis detecor having a high sensitivity to a light from an eye
Patent 5298927 Issued on March 29, 1994. Estimated Expiration Date: 
December 30, 2011. 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.
December 30, 2011. 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. 814493 filed on 12/30/1991US Classes:351/211, Including projected target image351/200, EYE EXAMINING OR TESTING INSTRUMENT351/205Objective typeExaminersPrimary: Sugarman, Scott J.Assistant: Dang, Hung Xuan Attorney, Agent or FirmForeign Patent References
International ClassA61B 003/10Foreign Application Priority Data1991-01-08 JPAbstractA visual axis detector includes an illumination device for illuminating an eye; an optical device for guiding light from the eye; the light being in a form of a light intensity distribution having first and second portions; a photo-sensing device, having an array of photo-cells, for receiving the light guided by the optical device, and for generating an electrical signal corresponding to the light intensity distribution; an arithmetic operation device for calculating a visual axis of the eye in accordance with the electrical signal generated by the photo-sensing device; and a control device for controlling the photo-sensing device to have different sensitivities for sensing the first and second portions of the light intensity distribution. | |
