Visor and camera providing a parallax-free field-of-view image for a head-mounted eye movement measurement system
US4852988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1988 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Sep 12, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0187
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head-mounted, eye-movement, measurement system is provided with an optically flat glass laminated visor through which the observer views the external scene. Mounted so as to be vertically spaced from one side of the eye's optic axis is an eye tracker module for recording the observer's eye-movement relative to the head, principally by measuring the position of the pupil and corneal reflex, by reflecting near infrared light to and from the observer's eye vis-a-vis the front surface of the visor. Mounted so as to be vertically spaced on the opposite side of the eye's optic axis is a field-of-view camera which records the external scene viewed by the observer by reflecting external scene light from the back side of the visor. The distances and angular relationship of the visor, camera and eye are controlled to eliminate parallax from the field-of-view camera while also providing a stable arrangement permitting wide-angle scene viewing and accurate recordal of eye movements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.