LASER PROJECTOR

摘要

A laser projector includes a laser source module for generating an input light beam, a deflection component that deflects the input light beam to mutually orthogonal first and second scanning directions to form a scanning light beam, a first prism and a second prism both used for allowing the scanning light beam to pass therethrough for performing two-dimensional scanning on an imaging surface and formation of an image. By adjustment of the angle between the first prism and the second prism, various conditions are satisfied to achieve image distortion correction and image lift.

主权项

1. A laser projector comprising:
a laser source that generates an input light beam for scanning and the input light beam being fed to a reflecting mirror of a deflection component for being scanned and formation of a scanning light beam; the deflection component that deflects the input light beam from the laser source to a first scanning direction and a second scanning direction; wherein the first scanning direction and a second scanning direction are mutually orthogonal and a scanning speed in the first scanning direction is faster than a scanning speed in the second scanning direction; a first prism having an incident surface and an exit surface; wherein the scanning light beam from the deflection component is passed through the incident surface of the first prism and the first prism to be emitted out from the exit surface of the first prism; the incident surface of the first prism and the exit surface of the first prism are arranged in a non-parallel manner; a second prism having an incident surface and an exit surface; wherein the incident surface and the exit surface are arranged not parallel to each other; the scanning light beam from the exit surface of the first prism is passed through the incident surface of the second prism and the second prism to be emitted out from the exit surface of the second prism; the scanning light beam performs two-dimensional scanning on an imaging surface to form an image on the imaging surface; the incident surface of the second prism and the exit surface of the second prism are arranged in a non-parallel manner; wherein an extended direction of an angle between the exit surface of the first prism and the incident surface of the first prism, and an extended direction of an angle between the exit surface of the second prism and the incident surface of the second prism are opposite to each other; the exit surface of the first prism, the incident surface of the first prism, the exit surface of the second prism and the incident surface of the second prism are arranged in a non-parallel manner; wherein the laser projector satisfies the following equations:
θsh>θsc>θs1>0° or θsh<θsc<θs1<0°; wherein θsh is an angle between the scanning light beam and a surface normal of the imaging surface in the second scanning direction with a larger absolute value while a deflection angle θs2 of the deflection component in the second scanning direction is maximum; θsc is an angle between the scanning light beam and a surface normal of the imaging surface in the second scanning direction when the deflection component is at an initial state (the deflection angle θs2=0); and θs1 is an angle between the scanning light beam and a surface normal of the imaging surface in the second scanning direction with a smaller absolute value while the deflection angle θs2 of the deflection component in the second scanning direction is maximum.