Optical equipment with device for detecting direction of visual axis
US5485241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1995 |
| Grant date | Jan 16, 1996 |
| Priority date | — |
| Expiry date | Feb 9, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2213/025
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.