Scanning display optical system
AssigneeCanon Kabushiki Kaisha
InventorsAkira Yamamoto, Naosato Taniguchi, Shuichi Kobayashi
Life of this patent
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Abstract
A display optical system includes a light-source unit, a first optical unit which collects a light beam from the light-source unit, a scanning member which scans the light beam from the first optical unit, and a second optical unit which focuses the light beam scanned by the scanning member on about a scanning surface. An optical axis, defined by an optical path along which a light ray travels from the center of the scanning member to the center of the scanning surface via the second optical unit, intersects itself. In addition, the second optical unit includes two reflective mirrors having positive optical powers.
Claims18
A display optical system comprising:
- a light-source unit configured to emit a light beam;
- a first optical unit which collects the light beam from the light-source unit;
- a scanning member which scans the light beam from the first optical unit;
- and
- a second optical unit which focuses the light beam scanned by the scanning member on about a scanning surface, the second optical unit including two reflective mirrors having positive optical powers,
- wherein an optical axis, defined by an optical path along which a light ray travels from a center of the scanning member to a center of the scanning surface via the second optical unit, intersects itself.
A display optical system comprising:
- a light-source unit configured to emit a light beam;
- a first optical unit collecting the light beam from the light-source unit and having surfaces, including an entrance surface, an exit surface, and two reflective surfaces, the surfaces surrounding an area filled with a medium with a refractive index of more than 1;
- a scanning member which scans the light beam from the first optical unit;
- and
- a second optical unit which focuses the light beam scanned by the scanning member on about a scanning surface, the second optical unit including two reflective mirrors,
- wherein an optical axis, defined by an optical path along which a light ray travels from a center of the scanning member to a center of the scanning surface via the second optical unit intersects itself.
Dependencies are inferred from the claim text.