Patent ID: 9477080
Filing Date: 2016-10-25
CPC Classification: B60K,G02B

Claim Text:
1. A head-up display device that makes a virtual image of a display image visible from a predetermined visual region by projecting the display image, which is drawn on a scan surface by scanning a laser beam, the head-up display device comprising: a screen member provided with a plurality of optical elements each of which has a curved surface portion curved to spread the laser beam to the predetermined visual region, wherein the scan surface is defined by an array of the curved surface portions of the plurality of optical elements; a first generation portion that generates a first laser beam irradiated to the scan surface as the laser beam to draw the display image; and a second generation portion that generates a second laser beam irradiated to the scan surface from a direction different than the first laser beam as the laser beam to draw the display image; wherein an intersection angle between a first optical axis line of the first laser beam and a second optical axis line of the second laser beam is settled to be equal to (m+Δ) multiplied by an interference angle of the laser beams diffracted by the curved surface portions between orders of the laser beams, where m is an integer and Δ is a value ranging from ⅓ to ⅔.