Image projection device

An image projection device comprising:

• a light source;
• a control unit configured to generate an image light beam based on image data and control emission of the image light beam from the light source;
• a scanning unit that is attached to a frame to be worn on a face of a user and two-dimensionally scans the image light beam emitted from the light source;
• a light guide member that is attached to the frame and disposed in front of an eye of the user, is formed of a glass material through which a plurality of image light beams emitted from the scanning unit at different times pass, has a plurality of reflection surfaces that reflect the plurality of image light beams, converges the plurality of image light beams reflected by the plurality of reflection surfaces at a first convergence point in the eye of the user, and then irradiates a retina of the user with the converged image light beams;
• a first optical member that is attached to the frame and converges the plurality of image light beams emitted from the scanning unit at a second convergence point before the light guide member and then causes the plurality of image light beams to enter the light guide member;
• and
• a second optical member that is disposed at the second convergence point and causes each of the plurality of image light beams to enter a last reflection surface, which reflects the plurality of image light beams last among the plurality of reflection surfaces included in the light guide member, as diffusion light,
• wherein a first reflection surface immediately before the last reflection surface among the plurality of reflection surfaces has a region on which both the plurality of image light beams reflected by a second reflection surface immediately before the first reflection surface and the plurality of image light beams reflected by the last reflection surface are incident, and reflects the plurality of image light beams reflected by the second reflection surface to the last reflection surface and transmits the plurality of image light beams reflected by the last reflection surface in the region.

An image projection device comprising:

• a light source;
• a control unit configured to generate an image light beam based on image data and control emission of the image light beam from the light source;
• a scanning unit configured to two-dimensionally scan the image light beam emitted from the light source;
• and
• a light guide member that is formed of a glass material through which the plurality of image light beams emitted from the scanning unit at different times pass, has a plurality of reflection surfaces that reflect the plurality of image light beams, converges the plurality of image light beams reflected by a last reflection surface, which reflects the plurality of image light beams last among the plurality of reflection surfaces, at a convergence point in an eye of a user, and then irradiates a retina of the user with the converged image light beams,
• wherein some image light beams of the plurality of image light beams pass through the last reflection surface, then enter again an opposite side of the last reflection surface and pass through the last reflection surface, are reflected by the last reflection surface, and are applied to the retina of the user, and remaining image light beams of the plurality of image light beams are reflected by the last reflection surface without passing through the last reflection surface, and are applied to the retina of the user, and
• wherein the last reflection surface has a reflectance of 15% or less.