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Optical equipment with device for detecting direction of visual axis

Image Number 10 for United States Patent #5485241.

An optical apparatus with a visual axis detecting device for converting the light reflected from the eyeball into an electrical signal and calculating the direction of visual axis from the electrical signal.Plural pairs of illuminating light sources are provided around the view finder, and one of the pairs is turned on to illuminate the eyeball, according to the output of a position detector detecting whether the optical apparatus is in a vertical or horizontal position, or of a distance detecting circuit for detecting the distance between the view finder and the eyeball, or of a judging circuit for judging whether the photographer wears spectacles or not, thereby enabling precise detection of the direction of visual axis.

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