Patent ID: 7137711
Filing Date: 2006-11-21
Classification: G02B,G06F

Abstract:
1. Data input apparatus used with an information system, the data input apparatus comprising: an imager; a light source adjacent to the imager; a retro reflector, the retro reflector being connected to a person; retro-reflected light, the retro reflected light being light from the light source which is retro-reflected by the retro reflector to the imager, the retro-reflected light having a fixed component, and the retro-reflected light having a variable component varied by the person, the variable component of the retro-reflected light caused by changing between obscuring and unobscuring at least a portion of the retro-reflector from within a field of view of the imager; an identity signal, the identity signal being input to the information system by the imager when the fixed component is detected by the imager in a time interval; and a signal, the signal being input to the information system by the imager when the variable component is detected by the imager in the time interval.