Line-of-sight detection device and head mounted display device
A line-of-sight detection device according to the present invention includes: a display element; an optical system configured to guide light from the display element to a user; a light source; an image sensor configured to capture light from the light source reflected by an eye of the user, through at least a part of the optical system, wherein the optical system includes a lens that has a first surface from which light from the user side is emitted to a light-receiving surface of the image sensor, and a second surface through which light from the light source enters, the lens is disposed at a position facing the image sensor and the light source, and optical aberration of the first surface is smaller than optical aberration of the second surface.
1. A line-of-sight detection device comprising:
an optical system configured to guide light from a display element to a user;
a light source;
an image sensor configured to capture light from the light source reflected by an eye of the user, through at least a part of the optical system, wherein
the optical system includes a lens that has a first surface from which light from the user side is emitted to a light-receiving surface of the image sensor, and a second surface through which light from the light source enters,
the lens is disposed at a position facing the image sensor and the light source,
a shape of the first surface is different from a shape of the second surface, and
the image sensor is disposed at a position that is not an optical axis of the optical system.
2. The line-of-sight detection device according to claim 1 , wherein
the first surface is a plane.
3. The line-of-sight detection device according to claim 1 , wherein
the second surface is a conical surface.
4. The line-of-sight detection device according to claim 1 , wherein
the first surface is constituted of a prism.
5. The line-of-sight detection device according to claim 1 , wherein
the lens includes a protruded portion, and a top surface of the protruded portion is the first surface.
6. The line-of-sight detection device according to claim 1 , wherein
the optical system includes at least 2 lenses.
7. The line-of-sight detection device according to claim 1 , wherein
the light source emits infrared light, and
the line-of-sight detection device further comprises a mask which is disposed between the light source and the optical system, and of which transmittance of infrared light is higher than that of visible light.
8. A head mounted display device comprising:
the line-of-sight detection device according to claim 1 ; and
the display.
9. The line-of-sight detection device according to claim 1 , wherein
optical aberration of the first surface is smaller than optical aberration of the second surface.
10. The line-of-sight detection device according to claim 1 , wherein
the first surface is a plane, and the second surface is a curved surface.
11. The line-of-sight detection device according to claim 10 , wherein
the second surface is a conical surface.