| CPC G02B 27/0093 (2013.01) [G02B 5/3083 (2013.01); G02B 5/32 (2013.01)] | 20 Claims |
|
1. A line-of-sight detection device, comprising:
an imaging element;
an illumination unit configured to illuminate an eyeball with a plurality of beams of illumination light;
an optical element configured to guide a plurality of beams of reflected light to a direction of the imaging element, wherein
the plurality of beams of reflected light includes the plurality of beams of illumination light reflected in a plurality of directions from the eyeball,
the optical element includes a plurality of optical elements,
a first optical element of the plurality of optical elements has:
a substantial difference in diffraction efficiency from a diffraction efficiency of a second optical element of the plurality of optical elements, or
a substantial difference in reflectance amount from a reflectance amount of the second optical element, and
each of the plurality of optical elements is configured to guide a respective beam of reflected light of the plurality of beams of reflected light in the plurality of directions from the eyeball to the direction of the imaging element;
an optical system configured to cause the imaging element to non-selectively receive the plurality of beams of reflected light in the plurality of directions from the eyeball; and
a calculation unit configured to convert, based on the plurality of beams of reflected light in the plurality of directions from the eyeball received by the imaging element, the plurality of beams of reflected light into at least one of information of eyeball movement or positional information of a pupil.
|