Image following information detecting device, image following device, image following information detecting method, and image following method

An image following information detecting device, comprising:

• an image display system including an image light projecting unit that projects image light, and a transmissive reflection member that reflects a part of the image light projected from the image light projecting unit toward an eyeball and transmits other parts;
• and
• a line-of-sight detection system including at least one invisible light source, a diffractive optical element provided integrally with the transmissive reflection member and including a reflective diffraction portion that reflects and diffracts invisible light from the invisible light source toward the eyeball, and a light receiving element that receives invisible light reflected by the eyeball and reflected and diffracted by the reflective diffraction portion,
• wherein a portion irradiated with a central portion of the image light of the transmissive reflection member and the reflective diffraction portion overlap each other when viewed from a thickness direction of the transmissive reflection member,
• wherein the line-of-sight detection system includes a plurality of the invisible light sources having different emission wavelengths, and obtains information for calculating a deviation between a center of an image displayed by the image display system and a line-of-sight that is an orientation of the eyeball for each lighting of the plurality of invisible light sources,
• wherein the diffractive optical element includes a plurality of the reflective diffraction portions stacked in a thickness direction and having different diffraction wavelengths and sizes, and
• wherein the line-of-sight detection system includes:
• a pupil diameter acquisition unit that acquires a pupil diameter of the eyeball;
• a plurality of the invisible light sources having different emission wavelengths;
• and a lighting control unit that can selectively light the plurality of invisible light sources on a basis of an acquisition result in the pupil diameter acquisition unit.

An image following device comprising:

• an image following information detecting device, comprising:
• an image display system including an image light projecting unit that projects image light, and a transmissive reflection member that reflects a part of the image light projected from the image light projecting unit toward an eyeball and transmits other parts;
• and
• a line-of-sight detection system including at least one invisible light source, a diffractive optical element provided integrally with the transmissive reflection member and including a reflective diffraction portion that reflects and diffracts invisible light from the invisible light source toward the eyeball, and a light receiving element that receives invisible light reflected by the eyeball and reflected and diffracted by the reflective diffraction portion,
• wherein a portion irradiated with a central portion of the image light of the transmissive reflection member and the reflective diffraction portion overlap each other when viewed from a thickness direction of the transmissive reflection member, and
• wherein the image light projecting unit is provided integrally with the transmissive reflection member;
• an actuator that moves the image display system and the diffractive optical element in a direction parallel to an in-plane direction of the transmissive reflection member;
• and
• a control device that controls the actuator on a basis of a signal from a light receiving element of the image following information detecting device,
• wherein:
• the diffractive optical element includes a plurality of the reflective diffraction portions of a vertically long shape stacked in a thickness direction and having different diffraction wavelengths and sizes,
• the line-of-sight detection system includes:
• a pupil diameter acquisition unit that acquires a pupil diameter of the eyeball;
• a plurality of the invisible light sources having different emission wavelengths;
• and a lighting control unit that can selectively light the plurality of invisible light sources on a basis of an acquisition result in the pupil diameter acquisition unit, and
• the actuator moves the image display system in a direction orthogonal to a longitudinal direction of the reflective diffraction portion.

An image following device comprising:

• an image following information detecting device, comprising:
• an image display system including an image light projecting unit that projects image light, and a transmissive reflection member that reflects a part of the image light projected from the image light projecting unit toward an eyeball and transmits other parts;
• and
• a line-of-sight detection system including at least one invisible light source, a diffractive optical element provided integrally with the transmissive reflection member and including a reflective diffraction portion that reflects and diffracts invisible light from the invisible light source toward the eyeball, and a light receiving element that receives invisible light reflected by the eyeball and reflected and diffracted by the reflective diffraction portion,
• wherein a portion irradiated with a central portion of the image light of the transmissive reflection member and the reflective diffraction portion overlap each other when viewed from a thickness direction of the transmissive reflection member, and
• wherein the image light projecting unit is provided integrally with the transmissive reflection member;
• an actuator that moves the image display system and the diffractive optical element in a direction parallel to an in-plane direction of the transmissive reflection member;
• and
• a control device that controls the actuator on a basis of a signal from a light receiving element of the image following information detecting device,
• wherein
• the diffractive optical element includes a plurality of the reflective diffraction portions of a horizontally long shape stacked in a thickness direction and having different diffraction wavelengths and sizes,
• the line-of-sight detection system includes:
• a pupil diameter acquisition unit that acquires a pupil diameter of the eyeball;
• a plurality of the invisible light sources having different emission wavelengths;
• and a lighting control unit that can selectively light the plurality of invisible light sources on a basis of an acquisition result in the pupil diameter acquisition unit, and
• the actuator moves the image display system in a direction orthogonal to a longitudinal direction of the reflective diffraction portion.