US 12,405,457 B2
Reflective pupil relay optics for mems scanning system
Nenad Nestorovic, Seattle, WA (US)
Assigned to STMicroelectronics International N.V., Geneva (CH)
Filed by STMicroelectronics International N.V., Geneva (CH)
Filed on Mar. 21, 2022, as Appl. No. 17/699,958.
Prior Publication US 2023/0296868 A1, Sep. 21, 2023
Int. Cl. G02B 17/06 (2006.01); G01S 7/481 (2006.01); G02B 6/42 (2006.01); G02B 17/02 (2006.01); G02B 26/08 (2006.01); G02B 26/10 (2006.01); G02B 27/01 (2006.01)
CPC G02B 17/0657 (2013.01) [G01S 7/4817 (2013.01); G02B 6/4215 (2013.01); G02B 17/023 (2013.01); G02B 26/0833 (2013.01); G02B 26/101 (2013.01); G02B 27/0172 (2013.01); G02B 2027/011 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical system, comprising:
an optical module comprising:
a RGB laser source configured to generate a combined RGB laser beam;
a fast axis mirror arranged along a first path to receive the combined RGB laser beam, the fast axis mirror being drivable to scan the combined RGB laser beam along a fast axis;
three optical surface magnification mirrors receiving the combined RGB laser beam as it is scanned along the fast axis and magnifying a diameter of the combined RGB laser beam;
a slow axis mirror receiving the combined RGB laser beam after magnification, the slow axis mirror being drivable to scan the combined RGB laser beam along a slow axis; and
an Offner mirror relay receiving the combined RGB laser beam as it is scanned along the slow axis and reflecting the combined RGB laser beam along a second path toward an exit aperture of the optical module;
a diffractive waveguide having an input diffractive grating defined therein and being positioned such that the combined RGB laser beam passes from the exit aperture of the optical module into the input diffractive grating, the diffractive waveguide having an output diffractive grating to be positioned adjacent to a user's eye; and
control circuitry configured to modulate the RGB laser source according to input image data so that as the combined RGB laser beam is scanned along the fast axis and slow axis, images represented by the input image data are visible to the user's eye.