Laser projector performing laser raster scan using a scanning mirror
View Patent ↗An enlarging optical unit receives laser light emitted from a laser light source, enlarges a light flux of the received laser light to have a diverging angle corresponding to a swing angle of a scanning mirror and provides it to the scanning mirror.
1. A laser projector comprising:
a laser light source emitting laser light;
a scanning mirror scanning the laser light emitted from said laser light source; and
an enlarging optical unit enlarging a light flux of the laser light emitted from said laser light source to have a diverging angle α corresponding to a swing angle of said scanning mirror, wherein said enlarging optical unit enlarges the light flux of said laser light to have the diverging angle α determined by the following equation:
α=arctan(tan (θ/2)/( YN/ 2))
where θ represents the swing angle in the horizontal and vertical directions of said scanning mirror, and YN represents a number of pixels in the vertical direction of a projected image.
2. The laser projector according to claim 1 , wherein
said enlarging optical unit enlarges the light flux of said laser light to have a diverging angle αx in a horizontal direction determined by the following equation:
α x =arctan(tan (θ x/ 2)/( XN/ 2))
where θx represents the swing angle in the horizontal direction of said scanning mirror, and XN represents the number of pixels in the horizontal direction of the projected image; and
said enlarging optical unit enlarges the light flux of said laser light to have a diverging angle αy in the vertical direction determined by the following equation:
α y =arctan(tan (θ y/ 2)/( YN/ 2))
where θy represents the swing angle in the vertical directions of said scanning mirror, and YN represents the number of pixels in the vertical direction of the projected image.