Patent ID: 8520310

Claim:
An image display device that guides image light from an image generation portion to an optical pupil of an eyepiece optical system, thereby allowing an observer to observe a virtual image of an image at a position of the optical pupil, the image generation portion including: a laser light source; a deflector that deflects and scans laser light emitted from the laser light source by a reflection surface in two scan directions which are perpendicular to each other; and a diffusion plate that is disposed on an image surface of the eyepiece optical system and diffuses the laser light deflected by the deflector; wherein the eyepiece optical system includes a holographic optical element of a volume-phase type and of a reflective type as a combiner which diffracts and reflects the image light from the image generation portion to guide the image light to the optical pupil and in parallel with which, transmits and guides external light to the optical pupil; and wherein when an axis that optically connects a scan center of the reflection surface of the deflector and a center of the optical pupil to each other is an optical axis, the image display device comprises: a virtual-image diopter adjustment section that moves the image generation portion along the optical axis to adjust a diopter of the virtual image; a correction lens that is disposed in a light path of the image light; and a correction lens movement section that moves the correction lens along the optical axis; wherein as the image generation portion is moved by the virtual-image diopter adjustment section, the correction lens movement section moves the correction lens while keeping the optical pupil and the reflection surface of the deflector in an optically conjugate positional relationship.