Eye attention monitor
Patent 4169663 Issued on October 2, 1979. Estimated Expiration Date: 
February 27, 1998. 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.
February 27, 1998. 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.Patent References 2724305 3583794 3724932 3864030 InventorAssigneeApplicationNo. 05/881794 filed on 02/27/1978US Classes:351/210, Using photodetector250/203.1Following a target (e.g., a star or instrument pointer or other object) other than a patternExaminersPrimary: Corbin, John K.Assistant: Bovernick, Rodney B. International ClassA61B 3/113 (20060101)AbstractA device for monitoring eye attention along an axis includes a telescope directed toward the eye, and a four quadrant photocell detector disposed at the image plane of the telescope. The four photocell outputs are summed to produce X, Y, and common mode signals. These signals are processed to form their absolute values, and are then summed to produce a voltage proportional to deviation of the direction of the eye from the desired axis. This voltage signal is compared with a background illumination signal by an adjustable threshold detector, which actuates a Schmitt trigger to indicate deviation of the attention of the eye. | |
