Eye direction detecting device
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorTakayuki Sensui
Life of this patent
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Abstract
An eye direction detecting device includes a light emitting optical system, which emits detecting light through a first optical path to be made incident upon an eye. A polarization beam splitter provided in the first optical path of the detecting light generates a second optical path. A light receiving optical system is provided in the second optical path, and a 1/4 wave plate is provided between the polarization beam splitter and the eye, so that light emitted from the light source can be effectively received by a light receiving element.
Claims15
An eye direction detecting device for determining a direction in which an eye gazes, comprising:
- a light emitting system that emits a detecting light;
- a light receiving system;
- a polarization beam splitter that directs said detecting light in a first optical path so that said detecting light impinges upon the eye, and in a second optical path so that light reflected from the eye impinges upon said light receiving system to determine a direction in which the eye gazes;
- and
- a 1/4 wave plate that is provided between said polarization beam splitter and the eye.
An eye direction detecting device in a single lens reflex camera having a view finder with an eyepiece lens for determining an eye gazing direction of a user of said camera, comprising:
- a light emitting system that emits a detecting infrared light;
- a light receiving system;
- an eyepiece lens located proximate the eye of a user;
- a polarization beam splitter that directs said detecting infrared light in a first optical path so that said detecting infrared light passes through said eyepiece lens and impinges upon the eye of a user, and in a second optical path so that light reflected from the eye impinges upon said light receiving system to determine said gazing direction of the eye;
- and
- a 1/4 wave plate that is provided between said polarization beam splitter and the eye of a user.
An eye direction detecting device for determining an eye gazing direction of a user of said eye direction detecting device, comprising:
- a light emitting system for emitting detecting infrared laser light, said light emitting system including a polarization beam splitter, said polarization beam splitter functioning to at least one of reflecting said detecting infrared laser light or transmitting said detecting infrared laser light therethrough, and a 1/4 wave plate through which said detecting infrared laser light reflected by or transmitted through said polarization beam splitter passes, wherein said detecting infrared light transmitted through said 1/4 wave plate is made incident upon the eye;
- and,
- a light receiving system, in which light reflected by the eye is transmitted through said 1/4 wave plate, and then transmitted through or reflected by said polarization beam splitter to thereby detect said gazing direction of the eye.
Dependencies are inferred from the claim text.